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help with rear diff ratio

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Old May 29, 2023 | 06:50 PM
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saad Aqel's Avatar
saad Aqel
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w210 2001
help with rear diff ratio
i just bought a E240 2001 w210 car
the past owner swaped the engine to 320 engine
so when i drive on 100km/h the RPM is going on 2600 while it should be on 2000 because of the engie replacment
can i swap the diff to a 3.07 diff and solve the problem? (the current diff is 3.67)
note: that my diff hasnt any sensor in it and this its OEM number 124 351 37 08
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Old May 29, 2023 | 07:44 PM
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This place is a joke.
You'll need the corresponding transmission control unit to match whatever ratio the rear axle has.
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Old May 29, 2023 | 08:01 PM
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w210 2001
Originally Posted by E55Greasemonkey
You'll need the corresponding transmission control unit to match whatever ratio the rear axle has.
seriosly i have swaped the diff yestrday at the same time i have changed the gearbox fluid filter and add a 1 liter of AT fliud (notice that i had never changed it before and i dont know if the past owner had changed it or not) then the car started in a limp mode on the fourth gear i should put it on N then return it to D while driving to reach the fifth gear i have tried over 3 TCU with diffrent numbers some of them stucks on the first gear and just one has the same issue with the current TCU i also had reset the tcu by a software called xentry i think nothing happend.
do think the problem is from my gearbox ?
or its programming issue ?
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Old May 29, 2023 | 08:27 PM
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This place is a joke.
If the TCU does not match the rear end ratio it will be in limp mode forever.
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Old May 30, 2023 | 10:31 AM
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w210 2001
do you mean there is no difference between the 240 and 320 gearbox? the only difference is the TCU ??
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Old May 30, 2023 | 12:45 PM
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Originally Posted by saad Aqel
do you mean there is no difference between the 240 and 320 gearbox? the only difference is the TCU ??
That I can't tell you, we don't have a 240 or 320 diesel here in the U.S. You would have to compare part numbers using the VIN of each vehicle for the transmission, TCU and rear axle. I do know there are different internal gear ratios for various 722.6 transmissions. The rear axle ratio is stored in the TCU. It has to match whatever is installed in the car.
Last edited by E55Greasemonkey; May 30, 2023 at 12:48 PM.
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Old May 30, 2023 | 06:02 PM
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w210 2001
i have tried all the TCU's that is compatible with the 320 engine and diff still same problem.
do you think the gearbox is dying?
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Old Sep 7, 2023 | 06:34 PM
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w210 2001
Update:
i have returend my old diff and every thing just get back to normal
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