RPM vs MPH vs MPG [Archive]

BigBlueBus

12-21-2007, 01:33 AM

Hello,
I've been getting about 500 miles on a tankful so far with my new Sprinter without any additives or anything like that and it just turned 2,000 miles. I've been reading that mileage will improve with age...I hope so. My Ram pickup (when empty) which weighs alot more than the Sprinter gets better mileage.

During a long trip one day and with nothing better to do than to stare at the road ahead, I have compiled the following table with observations from my new Sprinter which has a 4:10 axle ratio, according to my window sticker.

All numbers below are with trans in 5th gear.
Speed RPM's MPG MPG (when trailing a large vehicle like a semi)
60 mph 2400 25 27.5
65 mph 2600 23.5 26.2
70 mph 2800 22 25
75 mph 3000 19.8 24
80 mph 3200 17.9 22.5

note: mpg was taken as follows, I brought vehicle to desired speed, then hit reset button and waited to reading to stabilize, then noted the value given.

My question is: if someone with a Sprinter has a unit with a different geared rear end; if you could make the same table as above, it would shed some light on a question I've been asking myself ever since I took delivery of my van: "should I have opted for one with a lower gear?" It seems to me that the V-6 has plenty of power and such a high gear is not necessary, 3000 RPM's at 75mph seems EXTREMELY high and unnecessary, especially for a diesel!

Waiting to compare with your tables.
thanks,
John

Sprinter

12-21-2007, 04:54 AM

Your table looks just like mine, I have the same ratio, same RPM's and almost the same mileage (24 top) This is actually good mileage You get compare to most users here, it will go slightly up with time/miles and with RL You just bought. But don't expect miracles. 3.92 brings RPM's down only about 200 less or 5 miles faster at same rpm so it's still too high and You can see it by reading the long thread about mileage. Users with 3.9 ratio are usually getting the same or slightly better mileage (but also worse depending on van size, weight and speed) You can see now how big of a factor the wind drag is, so with vehicle of this size going 75-80 will use much fuel no matter what ratio.

I was going to change ring and pinion but authorities here advised me not to, instead I was advised to use bigger tires and I am going to get BF Goodrich 235/85 size, this tire diameter is 1,5 inch bigger than stock tire so it's like having 17" rims or going down to 3.9 ratio. It's the easiest way especially when You need new tires anyway I know however it's not gonna make big difference, I think we need 3.7 or even 3.5 ratio
You can actually buy 3.7 ring and pinion from previous model, I was assured it's the same diff and will fit new Sprinter but that's the easy part. Problem is resetting pump/computer? without doing so it would shift too soon and then struggle at too low rpm, too tricky, especially when You think of some dealerships who can't even change oil properly...

BigBlueBus

12-21-2007, 05:17 AM

You make some good points about wind drag; however, the rpm's is still much too high, especially for a passenger wagon. I don't normally go 75 or above as speed laws don't permit so wind drag is not a big issue. If the van is already equipped with a 5 speed transmission, then a lower gear should not be a problem when the van is loaded, or going uphill or pulling a heavy load. One can always downshift. But when you and I are in the highest gear, we can no longer upshift anymore.

I think my van will do fine and not be overworked at 2000 RPM when travelling at 70 MPH. Taken directly from the Sprinter website, the high torque plateau is flat at 280 lb.ft. from 1200 to 2400 RPM; going above 2400 RPM, the torque drops rapidly, so it makes no sense to have this high gear ratio.
I will research further into changing the rear end on mine. Are you certain that the rear end from the TN1 will fit? Does MB offer lower ratios for the NCV3 in Europe? If so, resetting the computer should be no problem. Also, less revolutions will ultimately lengthen the life of the engine considerably as well.

One thing I just thought of: If the Sprinter has an adaptive feature, won't it automatically adapt to the new gear ratio? If it knows how fast all 4 wheels are spinning at any RPM, why would the computer need to be reset?

Further discussion on this would be worth the while, don't you think?

Sprinter

12-22-2007, 03:56 PM

Yes, it would.

There was many threads like this one here, I think besides fuel economy it's the most popular topic.
http://sprinter-source.com/forum/showthread.php?t=1987

"Merdas" was the one looking into changing ring and pinion. I did my research as well and here's what I found.

http://www.trademotion.com/partlocator/index.cfm?action=getJointLocator&siteid=213693&chapter=&sectionids=23,0&groupid=10047&subgroupid=20042&componentid=61552&make=8&model=Sprinter&year=2007&catalogid=1&displayCatalogid=0

They have rings and pinions and actually 3.72 is the cheapest at just over $400 (3.92 at my dealer is $1100) I called sales dept. because it says 03-07 same parts, they assured me it's the same diff. Well, I don't know but if You look under 06 and 07 rear end looks different. Besides, in the brochure for 2007 it says "whole new rear end with dual bearings"
You would also need seals and bearings to change pinion and they don't have it at Trademotion.
So it's really not so easy when it comes to actually doing it

jdcaples

12-24-2007, 02:48 AM

The 4.10 rear axel ratio is on the window sticker of many North American NCV3s.

I believe the axel is stamped with 4.18.

Per this thread posting (http://sprinter-source.com/forum/showpost.php?p=17400&postcount=3) BigBlueBus, I'll gather some metrics for you as soon as I'm able. It might be the mid-morning of the 25th.

Oh, and I should tell you that I'm not going to be drafting (trailing a large vehicle like a semi) to get the third column for ya.

There is no place in Seattle where I would feel comfortable going 75 or 80, esp in our current weather, with a number of people driving when they should have taken a taxi and with law enforcement's extra patrols seeking said people of poor judgement.

-Jon

jdcaples

12-24-2007, 04:46 AM

One more thing about "Trademotion."

Berry Autos is a Dodge dealership in Texas. They sell Sprinter parts though a contracted web service provider called "TradeMotion.Com"

Trademotion (http://www.trademotion.com) is not exclusive to Berry Autos.

Trademotion serves many dealerships.

Trademotion site 722 (http://www.trademotion.com/partlocator/index.cfm?siteid=722) serves a Nissan Dealership. Trademotion site 213693 (http://www.trademotion.com/partlocator/index.cfm?siteid=213693) is Berry Autos Dodge Dealership. Mark is the Berry Autos employee that sold Sprinter parts to me via the Trademotion website.

The content at Berry Auto's Trademotion store front is not up-to-date, as you've noticed. Parts that should say 03-06, say 03-07.

Do not go by the website content for making decisions.

Call Mark at 1-866-886-7296. If you order via the Trademotion website, Mark is probably the one that will package up the parts and ship them to you.

He usually calls to confirm the year of the vehicle and checks the Chrysler parts computer, which is way more authoritative than what has been provided to Trademotion.

-Jon

jcell

12-24-2007, 06:33 PM

You might have a hard time comparing mpg with other owners as quality of fuel seems to have a drastic effect on consumption. I've clocked over 30k on my 170" 2500 and have fueled up in every region of the U.S. but the northwest. Fuel mileage for me has been all over the place whether I'm running empty or loaded w/3k!. I can say this, at highway speeds the 3.92 ratio keeps you closer to that 2400 rpm torque plateau and seems to make quite a difference compared to you guys with the 4.10. I also went to a 265/75/16 and noticed an immediate improvement. Last week I drove I-70 between I-15 and I-76 from Utah to Denver through the mountains and got 23.5 mpg. This is without drafting semis and using Power Service winter additive w/cetane boost. On a flat stretch through eastern Colorado on the same trip I averaged 26.6 mpg over 150 miles before I stopped to fuel up. Minimal headwinds or tailwinds can easily skew your numbers 2-3 mpg in either direction. I'll also note that mileage numbers for me have been creeping up as this motor breaks in. Hope I've been helpful and not just long winded.

-Jesse

BigBlueBus

12-25-2007, 04:29 AM

You might have a hard time comparing mpg with other owners as quality of fuel seems to have a drastic effect on consumption. I've clocked over 30k on my 170" 2500 and have fueled up in every region of the U.S. but the northwest. Fuel mileage for me has been all over the place whether I'm running empty or loaded w/3k!.
I can say this, at highway speeds the 3.92 ratio keeps you closer to that 2400 rpm torque plateau and seems to make quite a difference compared to you guys with the 4.10. What do you mean quite a difference, please elaborate.

I also went to a 265/75/16 and noticed an immediate improvement. Improvement in mileage, performance, or what?
Last week I drove I-70 between I-15 and I-76 from Utah to Denver through the mountains and got 23.5 mpg. This is without drafting semis and using Power Service winter additive w/cetane boost. On a flat stretch through eastern Colorado on the same trip I averaged 26.6 mpg over 150 miles before I stopped to fuel up. These are great numbersMinimal headwinds or tailwinds can easily skew your numbers 2-3 mpg in either direction. I'll also note that mileage numbers for me have been creeping up as this motor breaks in Yes, I've heard this from a number of people already. Hope I've been helpful and not just long winded.Yes, very helpful...thanks and please elaborate further. What is your rpm at say, 70mph, 75mph and 80mph.

-Jesse
What is your rpm at say, 70mph, 75mph and 80mph?
thanks,
John

Sprinter

12-25-2007, 05:51 PM

ChasM

12-25-2007, 08:21 PM

OK , I don't get it. stock tire is 245/75/16, how can You improve with 265/75/16? This tire is only wider but size and diameter is the same.

The wider tire with the same the same 75% aspect ratio should have a larger diameter as well, or maybe not??

jdcaples

12-25-2007, 08:34 PM

Here's a web tool that will help calculate the impact of different tire sizes.

http://www.discounttire.com/dtcs/infoTireMath.dos

jdcaples

12-25-2007, 09:05 PM

Sprinter

12-26-2007, 12:46 AM

Here's a web tool that will help calculate the impact of different tire sizes.

http://www.discounttire.com/dtcs/infoTireMath.dos

OK, that makes sense now, thanks and sorry

BTW, jdcaples, this is awesome mileage especially at 60 MPH! I assume it's not just computer readout but real life calculations

If I was getting close to 30 MPG I would keep my Sprinter...:)

jdcaples

12-26-2007, 01:22 AM

OK, that makes sense now, thanks and sorry

BTW, jdcaples, this is awesome mileage especially at 60 MPH! I assume it's not just computer readout but real life calculations

If I was getting close to 30 MPG I would keep my Sprinter...:)

No, it's the computer read out. I posted the info because BigBlueBus asked me to. (http://sprinter-source.com/forum/showpost.php?p=17400&postcount=3) I followed his requested methodology (http://sprinter-source.com/forum/showpost.php?p=17181&postcount=1) (first post of this thread).

I did modify the methodology - trying to reduce variables - by taking readings on the same stretch of road way, going the same direction trying to only change the velocity.

I also didn't just "wait for the reading to stablize." I let cruise control take over for 2 miles before taking the reading. I didn't mind doing it, but that's about all I have to say about those numbers.

In practice and pump, I went about 100 city miles and 80 highway miles on 7.5 gallons of fuel a week or so ago. To me, that's more useful information.

-Jon

PS: I believe the driving style, payload and terrain have a lot more to do with realized fuel economy than equipment.

I think the 3.92 rear end promotes better fuel consumption at highway speeds, but I don't think it's "a sure thing." Yes, there's a 7% difference in the ratios, but I think I could obviate the benefit - and PERHAPS turn in single digit mileage reports - if I would just drive poorly.

I don't have any evidence gathered scientifically to support my assertion. It's just my gut feeling. I ordered the 3.92. If the Sprinter had arrived with 4.18 rear axle, I'd have accepted it anyway. It's a good vehicle.... the best for my needs.

SprinterUSA1

12-26-2007, 02:28 AM

......................

-Jon

PS: I believe the driving style, payload and terrain have a lot more to do with realized fuel economy than equipment.
........

Agree,

I usually take it easy with acceleration and otherwise do not use a heavy foot and so on. But my payload is around 1500lb all the time plus some extra or a trailer (2600lbs empty) every once a while. The terrain here is lots of hills and ups and downs. I average 17-18mpg most of the time. With trailer it never gets above 15mpg. I do notice that if I hit a mostly flat terrain the mileage goes up fairly quickly. I never drive far enough though so the average is still low. This is the only time ( at the pump) where I wish I still had my T1N.
I do a lo of short trips which certainly makes matters worse.

SprinterUSA1

mobileoilchange

12-27-2007, 04:52 AM

dont assume that just because two tires of the same size "265/75/16" have the same circumference. no two tire companies will be the same, and also factor in the air pressure difference, weighted load, etc. I drag race mustangs, and tire sizes are different from brand to brand and even on the same brand with a different model of tire are different circumference. just my :2cents:

BigBlueBus

12-27-2007, 05:19 PM

60 mph 29.2 mpg 2200 RPM
65 mph 26.7 mpg 2400 RPM
70 mph 24.1 mpg 2600 RPM

I drove the same stretch of mostly flat high way.

All my readings were taken from driving same direction.

I hit the reset button after setting cruise control. I captured the mileage calculation after 2 miles of velocity maintenance by cruise control.

jdcaples,
Thanks for the info. I was more interested in RPMs at given speeds than fuel economy, since I know there are way too many variables (vehicle size, odometer on given vehicle, load, driver habit, wind, etc..etc..etc) to accurately compare one vehicle's readings to another. Now I know that the optional ratio basically just lowers the rmp's by about 200 revs. Not enough where I would still feel is optimal. At 70MPH, I would like this engine to rev at most 2200-2400 RPM; I'm not sure what ratio that would actually be, 3.5?? Does anyone know how to compute this?

thanks,
John

Sprinter

12-28-2007, 12:04 AM

Yes, very simple, just go down 200 RPM with each ratio
If 3.9 is 2600 rpm @ 70 MPH then
3.7 2400 @ 70
3.5 2200 @ 70 (approx.) and that's what Sprinters are missing. They have luxury steering wheels, xenons, suspension seats and other "cool stuff" You can live without but they don't have what's most important

BigBlueBus

12-28-2007, 05:22 AM

I was told that MB does offer a lower ratio for the T1N vans and that a T1N rear end was the same as for a 2007+; does anyone know this to be true?

Now I'm also wondering if it will be simpler to change the fifth gear, rather than the rear end. Any experienced transmission shop can do this.

John

sikwan

12-28-2007, 05:55 AM

I was told that MB does offer a lower ratio for the T1N vans and that a T1N rear end was the same as for a 2007+; does anyone know this to be true?

My guess, John, that they're not the same.

T1N Passenger 140
http://sprinter-source.com/forum/attachment.php?attachmentid=1115&d=1171864089

NCV3 144 Cargo
5494

BigBlueBus

12-28-2007, 05:58 AM

It looks very different to me; know of any good transmission mechanics then?

John

sikwan

12-28-2007, 06:31 AM

Now I'm also wondering if it will be simpler to change the fifth gear, rather than the rear end. Any experienced transmission shop can do this.

I would think getting a custom made match set of diff gears and installing them are going to be cheaper than doing a transmission change overdrive gear change. :idunno: I've worked on differentials before and IMHO, they are by far much simpler to deal with than an automatic transmission.

Another option would be something like a Saturn Overdrive (http://www.public.asu.edu/%7Egrover/willys/od.html) from Advance Adapters to mount on the back of your transmission.

Just drive slower and use your Corvette for speed. :bounce:

BigBlueBus

12-28-2007, 03:12 PM

I would think getting a custom made match set of diff gears and installing them are going to be cheaper than doing a transmission change overdrive gear change. :idunno: I've worked on differentials before and IMHO, they are by far much simpler to deal with than an automatic transmission. I would not even know where to begin to look, custom speed shops? If I do this change at a price of about $1000, it will pay for itself in fuel savings in no time; but my main concern and what I'm ultimately after, is the extra unnecessary wear on the engine from the high rpms.

Another option would be something like a Saturn Overdrive (http://www.public.asu.edu/%7Egrover/willys/od.html) from Advance Adapters to mount on the back of your transmission. I doubt anyone makes this for a Sprinter, but I heard in other markets like Europe or Down Under where Sprinters are sold, there are more options for rear end ratios, I can probably just get a gear set overseas and have it installed here; I wonder how the computer will react: will it adjust itself since it's an adaptive computer or will it have to be reset somehow, and who can actually do this recalibration correctly is another question.

Just drive slower and use your Corvette for speed. :bounce:

The only flaw with this theory is that I can't fit all 4 kids, the wife, dog, and their gear into the vette, but I can fit the vette into the Sprinter, I've measured it; If I can drive the Sprinter fast, then it will be like driving the Vette because it will be with me :smirk:.

BigBlueBus

12-28-2007, 03:15 PM

Richard (Altered Sprinter),
Can you please look into the possibility of doing a gear swap like I've mentioned above with parts from your neck of the woods.

thanks,
John

PLUMMER

12-28-2007, 08:07 PM

If it hasnt already been mentioned the 75 is a percentage value of the width for the side wall height. So his tire is larger diameter. I am guessing its too small to make a difference tho.

Well since my last posting about additives and milage, I have to say the brand is the biggest factor to effect milage. The winter mix has hurt the MPG's badly. ( 2-4 MPG less). I thought after November 1st I was stuck with the winter blends, but for what ever reason I tanked up at a new Marathon station and pulled a whopping 25.4 mpg's, compared to the previous month of ( i assume winter blend) horrible milage. As low as 17's with 10K miles on the van. So by sticking with a few particular stations I have managed to keep the better milage during winter. Marathon and shell being by far the most consistent and best milage. Its been cold and idleing has also played a big factor for me, I have seen as low as 12's when I include the idle time. Drafting is very helpful but very inconsistent to measure. The method of this circumstance for MPG's is nice info but not useful. I have seen 30+ mpgs for a 70 mile streche at 68 mph when drafting a semi within 10-20'. You just have to find the right driver that'll let you. But pull out of the draft and it went down to19-20.. I have found that no matter how you drive as long as its under 55 you'll get good milage. I feel the sweet spot rpm is 1800 rpm under low load. Towing I feel 2100 is good.

In my case where I drive alot over 65 mph it would help to go to a higher gear for the rear. I think anything more than a 300-400 rpm drop will not gain anything especially if GVW is over 66-6800 lbs. Even tho torque is very flat, its actually the HP that makes the difference once the truck is moving.

BigBlueBus

12-28-2007, 09:50 PM

Plummer,
That's exactly the point I've been trying to make in this thread and you have confirmed my thoughts on this: these vans definitely need a lower gear; my thought is that in Europe they are driven mostly in town, but here in the states most of us do the most driving above 65MPH in expressways.

I think we should concentrate on finding a cheap solution to the high rear end ratio, maybe by buying the parts from Europe or down under and having them installed here. But someone has to do the first install and report to the rest of us. I don't mind being the first one, I just need some help in finding a gear set. AlteredSprinter, any thoughts?

John

Sprinter

12-28-2007, 10:43 PM

Plummer,
my thought is that in Europe they are driven mostly in town, but here in the states most of us do the most driving above 65MPH in expressways.

John

Hi! That's a good one! I can tell You probabbly haven't been in, let's say Germany yet. If You'd travel 65MPH on autobahn You'd have to stick to the right lane as left one is reserved for more common speeds - 100+ MPH:):):) NO SPEED LIMIT baby! You see cars running 120-130 MPH all the time and their Sprinters are going fast too, but for lower rpm's they use something we can't have here - 6th gear. My friend from Europe told me You have to pay extra for auto tranny but "who wants that?" six speed manual is standard Oh, well time to go back to the old country....

BigBlueBus

12-28-2007, 11:20 PM

Hi! That's a good one! I can tell You probabbly haven't been in, let's say Germany yet. If You'd travel 65MPH on autobahn You'd have to stick to the right lane as left one is reserved for more common speeds - 100+ MPH:):):) NO SPEED LIMIT baby!
No I have not been in Germany, but I have relatives there and they very rarely drive faster than 65MPH; autobahn is about the only place you can go fast

You see cars running 120-130 MPH all the time and their Sprinters are going fast too, but for lower rpm's they use something we can't have here - 6th gear. I don't think anyone in their right mind would drive their Sprinter at 120MPH, it's not a race car, besides even with a 6th gear, the computer would not allow it and the engine could not overcome the wind drag. On a test run, a T1N Sprinter topped out at 160Km which is about 100MPH. Sprinters are sold in all of Europe, all of which has speed limits (autobahn being the only exception) mostly for delivery vehicles that travel in-town making deliveries, much like FedEx here in the states, they are mostly driven around town.

My friend from Europe told me You have to pay extra for auto tranny but "who wants that?" six speed manual is standard Oh, well time to go back to the old country....

If anyone has any actual facts, please feel free to share with the rest of us.

andrew315

08-26-2008, 08:15 PM

I am just about to go shopping for a used 2007-8 sprinter. How do know which rear axle it has? Is there a code on the specification plate / sticker?

Barrelsaver

08-26-2008, 08:29 PM

There is a label on my '08 144 rear axle on the aft side of the axle on the RH side of the ring gear housing. You'll have to crawl under the back to see it.
Best regards...TK

sikwan

08-26-2008, 10:49 PM

What Barrelsave said...

...on my 06 140 T1N which btw looks like a different axle.
http://sprinter-source.com/forum/attachment.php?attachmentid=1110&d=1171863771

You would think it would be in the same location, but a picture that I took at some auto show...
9427
...the only label I see is the white one behind the cables on the right side. This is on a 144 Cargo. I guess you really have to crawl underneath to find it or even read it.

jdcaples

08-27-2008, 05:37 AM

I guess you really have to crawl underneath to find it or even read it.

Further, you may have to scrape off some factory, protective/waxy coating that resembles cosmoline. It is on the right (passenger) side of North American axles, on the tube, not the gear housing. The label on my axle assembly is visible from the rearward position. What I mean: You don't have to crawl under the tube to view it from the front side. I

can see mine with my head near the rear-side of the interior face of rear disc brake assembly.

-Jon

gary 32

08-27-2008, 02:51 PM

You might also try the www.gearvendors.com web site, your 5 speed auto could become a 10 speed auto...
As for me I think I am very happy with my mileage/acceleration figures with my large brick shaped vehicle and it's "4.10" rear end. My mileage is in line with all the realistic figures given, around 18-22 with my right foot being the defective part. The $1,000-3,000 for any after market solutions offered still buys a lot of fuel and the pay back period would be pretty long.

stefanhelgeson

04-05-2009, 06:33 PM

Hello all,

Thank you for your thoughts and information on the axel ratios option.

We just bought a used 144" wheelbase high top 07 diesel with the 4:10 ratio - something I didn't discover until after I closed the deal from a third party. We are planning on converting it into a camper van - and expect to add about 1,200 - 1,500 lb of (permanent) payload to do this, plus fluids. We also plan to carry a canoe and or kayak on the roof, plus potentially add a A/C on the roof- all producing drag. We do not expect to being towing much of anything at this time (never know when this might change) and only plan on hanging bikes off the rear hitch most of the time. We plan to tour around the US and Alaska, spending as little time as possible on the freeways (yet knowing that we still be a big part of our travels).

I have been told that a lot of issues with RV's is that the engines and transmissions get overloaded with the permanent features and weight of a typical conversion. Yet, I have the shortest body option (albeit with the high roof). Seems like the 4:10 may still be overkill.

Question is, should I keep this van with the lower ratio or trade it for a 3:92 before we start the conversion? It only has 15K miles and we got it for $29K.

jdcaples

04-05-2009, 07:07 PM

I think you scored at $29k. My van has 16,400 miles plus change on it, and it would take a lot more money than $29k to convince me to part with my Sprinter; in fact, the number is not economically reasonable.

It sounds like you want a purely recreational ride and I think what you have is suitable to task.

Fwiw, the ratio actually 4.18:1, not 4:10:1 and while people whine about it, no one's said, "I'm trading my Sprinter with the 4.18:1 rear axle for one with the 3.9." Oh, and it's not yet - and may never be - economically sane to swap rear axles and all the electronics that should be changed along with it.

Unless you're planning to own your Sprinter absolutely as long as possible, you want it to cruise at the maximum efficiency available today, and it's going to annoy you that your engine spins more times per minute than mine to go the same speed, I'd say the 3.9x:1 ratio rear is not going to make that much difference to you.

BTW, all NAFTA NCV3 Sprinters have a 5000 lbs / 2200 kg tow rating so keep that in mind when you're trying to figure out if it's going to be ok.

Jon

jmgasior

04-05-2009, 10:17 PM

is there any way of telling rear end ratio other than crawling under vehicle,thanks

OrioN

04-05-2009, 11:04 PM

On quick way, all 2007's were made only with the 4.10/4.18... If you're 2008 & up call the dealer with your VIN...

jdcaples

04-06-2009, 12:10 AM

On quick way, all 2007's were made only with the 4.10/4.18... If you're 2008 & up call the dealer with your VIN...

I ordered and received the 3.92:1 rear ratio on my 2007 Sprinter.

The default was 4.18 and almost noone - including dealership sales people trying to put the "new" 2007 Sprinters on the lot - did what I did; purposefully order the other ratio. In 2008, Chrysler started ordering 3.92 as a default.

-Jon

OrioN

04-06-2009, 03:06 PM

I ordered and received the 3.92:1 rear ratio on my 2007 Sprinter.

The default was 4.18 and almost noone - including dealership sales people trying to put the "new" 2007 Sprinters on the lot - did what I did; purposefully order the other ratio. In 2008, Chrysler started ordering 3.92 as a default.

-Jon

Interesting.... perhaps a Canada/USA thing... my dealer told me that he ordered 3.92's and all he ever received was 4.18's, and was not happy nor given a proper explaination...