Wondering what Differential Ratio your T1N has? One way to answer that question is to get a Data Card or Factory Build Card which is keyed to your VIN number. The ratio is listed there.
General information about Data Cards is here:
Data Card Datacard Revealed. I'll show mine, you show yours.
https://sprinter-source.com/forum/showthread.php?t=25620
Sailquik Roger has been very helpful in providing members the information.
AC6 = AXLE RATIO 1 = 3.727 (Seems common for NAS aka NAFTA 2500 passenger models.)
??? = AXLE RATIO 1 = 3.92 (NCV3 designation)
AR3 = AXLE RATIO 1 = 4.182 (NCV3 designation)
Added:
Options that I'm aware of.
AC2 - AXLE RATIO I = 4,111
AC3 AXLE RATIO I = 4,375 (Euro models?)
AC4 = AXLE RATIO 1 = 4.857 (Euro models?)
AC6 AXLE RATIO 1 = 3.727
A hint for the 3.727 Ratio.
I have noticed that the 3.727 2006 passenger 2500HC (OEM, no DARF mod) 4th gear at 3000 RPM is almost exactly 70 mph by the speedometer. 70 mph in 5th gear is around 2500 RPM. I find that 3000 rpm in 4th sets up a good torque for long grades. Toggling between 4th and 5th gives a decent engine speed for flats and climbs when needed.
Feel free to add any information to this thread.
I'd be interested to know the RPM corresponding speedometer reading (not GPS speed over ground) for the 3.92 and 4.182 differentials.
Tire size doesn't matter. Even though with stock tires the Sprinter speedometer is known to have an approximately 3 mph discrepancy, the drive wheel (Axle 1) ratio remains the same. Tire size will affect speed over ground though (a larger diameter tire will cover more distance per wheel revolution).
vic
General information about Data Cards is here:
Data Card Datacard Revealed. I'll show mine, you show yours.
https://sprinter-source.com/forum/showthread.php?t=25620
Sailquik Roger has been very helpful in providing members the information.
You can crawl under the truck and read the label.Guys/Gals,
In order to "streamline" getting your DataCard for you could you please send me a PM
INCLUDING A VALID EMAIL ADDRESS to return the card to you.
The reason for the email address is that the Sprinter-Source PM software does not like attachments and
I have found no "work around". It's much easier for me to simply email the DataCard back to you.
The "printer" feature on MBSprinterUSA EPC.net easily converts the data to a .PDF so that is not an issue here.
I'm getting a lot of requests, that's fine, I will try to be helpful here.
I'm not real comfortable with posting them to a public forum, I'll let you make that
choice AFTER I send you your DataCard.
I'm also not "collecting" email addresses for any reason. Once I return your
DataCard I delete the email address.
Roger/sailquik
Some general T1N differential information.Label riveted onto the rear axle!
Dennis
AC6 = AXLE RATIO 1 = 3.727 (Seems common for NAS aka NAFTA 2500 passenger models.)
Added:
Options that I'm aware of.
AC2 - AXLE RATIO I = 4,111
AC3 AXLE RATIO I = 4,375 (Euro models?)
AC4 = AXLE RATIO 1 = 4.857 (Euro models?)
AC6 AXLE RATIO 1 = 3.727
A hint for the 3.727 Ratio.
I have noticed that the 3.727 2006 passenger 2500HC (OEM, no DARF mod) 4th gear at 3000 RPM is almost exactly 70 mph by the speedometer. 70 mph in 5th gear is around 2500 RPM. I find that 3000 rpm in 4th sets up a good torque for long grades. Toggling between 4th and 5th gives a decent engine speed for flats and climbs when needed.
Feel free to add any information to this thread.
I'd be interested to know the RPM corresponding speedometer reading (not GPS speed over ground) for the 3.92 and 4.182 differentials.
Tire size doesn't matter. Even though with stock tires the Sprinter speedometer is known to have an approximately 3 mph discrepancy, the drive wheel (Axle 1) ratio remains the same. Tire size will affect speed over ground though (a larger diameter tire will cover more distance per wheel revolution).
vic
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