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Old 08-04-2019, 11:56 AM   #1
Hugh.M
 
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Default Diff ratio change, sensors and year model

Hi All
I have a 2007 WDB9066332S134348 Twin turbo 2.1 with a 5s auto it had 4.18 diff I have replaced this with a 3.69 out of WDB9066352P199782 2015 v6 7s auto
The diff sensors won't read, the dealer changing the codes suggests the old abs module wont read the newer sensors or won,t accept this ratio with a 5 speed box.
Does any one have any knowledge if these will work together or have a van with this combo?
I am going to clean the sensor and diff mating surfaces and check the alignment of the holes any other suggestions on the air gap to wide fault code. It only gets 1st gear at the moment.
Thumbs up to Newcastle NSW Merc for their help.
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Old 08-05-2019, 10:52 AM   #2
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Default Re: Diff ratio change, sensors and year model

Hugh.
I question the wisdom of this diff change. This model fails due to excessive torque damaging the main bearing caps. A taller ratio is only going to make it fail earlier. How many Ks has this vehicle done? Have you read the rant about 315 exploding engines? Eric.

Last edited by Eric Experience; 08-05-2019 at 11:55 AM.
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Old 08-05-2019, 03:54 PM   #3
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Default Re: Diff ratio change, sensors and year model

All the modules (including the ignition lock module, TCM, ECM, etc) need to be variant coded to the new ratio. Otherwise the auto trans will go into limp home mode, as well as other undiscovered issues. Its likely only a dealer can do this, as you need engineering support from MB directly. To my knowledge the star programming tool can't change some of these variant codes without a special key from the factory.

I don't think the speed sensors change? If so, just swap the old sensors in.
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Old 08-05-2019, 08:38 PM   #4
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Default Re: Diff ratio change, sensors and year model

Thank you for the replies,

I have rebuilt this engine and pinned the main caps, nearly 60k and no problems, Redarc gauges keep me informed.

All modules have been coded by Merc Newcastle NSW. The only fault codes left are the "too much air gap"

The rear sensors are not reading direction hence my question are the 2015 sensors not being read by the 2007 module and yes the sensors are different part numbers.
Cheers
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Old 08-05-2019, 08:58 PM   #5
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Default Re: Diff ratio change, sensors and year model

Interesting. You can put a scope on them to see what voltage they are making. Are they physically the same size?
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Old 08-05-2019, 11:42 PM   #6
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Default Re: Diff ratio change, sensors and year model

How do you mean put a scope on them? Do you mean a volt meter for ohms?
Yes they are identical but different part numbers, the axles are all the same part numbers and the bearings and magnetic rings come as part of the axle. My understanding is that the sensors need to match the ratio of the diff.
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Old 08-05-2019, 11:49 PM   #7
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Default Re: Diff ratio change, sensors and year model

One method is to connect a volt meter set to AC volts, then spin the wheel. This assumes they are 2 wire sensors. Usually the signal should be between 2-6VAC.

Another method is using an oscilloscope. This lets you view the waveform.

If the sensors use 3 wires instead of two, the process is different. To my knowledge MB uses 2 wire sensors.
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Old 08-06-2019, 03:30 AM   #8
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Default Re: Diff ratio change, sensors and year model

Quote:
Originally Posted by Hugh.M View Post
How do you mean put a scope on them? Do you mean a volt meter for ohms?
Yes they are identical but different part numbers, the axles are all the same part numbers and the bearings and magnetic rings come as part of the axle. My understanding is that the sensors need to match the ratio of the diff.
Hi Hugh
I believe he meant to use an ocillscope to look at the shape of the output wave and measure the voltage also. It is a common instrument that electrical technicians have as well as automotive technicians.
eg here is a simple portable example !https://www.ebay.com.au/itm/New-Hand....c100005.m1851
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Old 08-06-2019, 05:42 AM   #9
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Default Re: Diff ratio change, sensors and year model

Thanks, a beautiful description.
They may have an oscilloscope
2 wires I will be at the vehicle tomorrow and give feed back
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Old 08-06-2019, 10:46 AM   #10
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Default Re: Diff ratio change, sensors and year model

Hugh.
Pinning the caps does not make them stronger. Your wheel sensors should work normally, make shore you have pushed them all the way in, I use a small hammer to make sure the sensor is pushed through the spring retainer and in contact with the tone wheel. Eric.
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