Just researched the R129 diffs a bit more and it seems that the 300SL's with the M103 came with a 3.92 differential.
Can anyone confirm whether this is the case for US models as well? And will they fit into a W201?
I know that the larger pumpkin cases in the W124 have 129 numbers stamped into them, so if W201 and W124 differentials can interchange, I would think the R129 would fit as well. Unless it is physically too big to fit the 190E subframe.
I do not mind swapping axles or the input shaft, as long as I know what needs to be swapped.
Thanks for the input so far.
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Originally Posted by babymog
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Great information, thank you.
According this, I am guessing an R129 differential will not fit into a W201, because there is no four-bolt cover that will swap onto it. However, I would assume it is possible to put an R129 differential into a W124.