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Old 12-15-2009, 08:39 PM
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Oldbeaver Oldbeaver is offline
MBZ 1993 turbo diesel
 
Join Date: Jul 2007
Location: Chile
Posts: 52
Need a 3.92 differential for a W124 diesel.

Hello all!

I am looking for a 3.92 differential for my 300E 1989. At present, I have a 3.46 differential, but I think it is too long.

What MB models carried a 3.92 differential?

Originaly, my car had a 3.07 differential. When I swapped the gas engine for a diesel, it became far too long. Then I discovered a used diff in a dismantling yard with a 3.46 ratio. The donor car was a 201 (W201 I suppose), probably a C280?

It looked very similar bolt to bolt, and after interchanging the palliers, it fitted in place. The car performance improved quite a lot.

However, the engine is revving too slow even now. I can drive for the city at 45 miles/h at 1500 rpm. Maximum speed I have attained so far (donīt like to run too much) is 105 miles at 3500 rpm, while max performance of the car is at 4500 rpm. I rarely drive the car at more than 2000 rpm. Only in slopes or over 65 miles/h.

The engine donor car had a final ratio of 4.09.

I know there are several experienced guys in the Forum, that may be able to help. Do you people know which Mercedes models used 3.92 final ratio differential, which is compatible with a normal W124 differential? This would ease the search for the differential.

I also have a 3.07 diff just in case.

Thank you very much in advance,

Old Beaver
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