Quote:
Originally Posted by martymil
By the time you do the conversion it will cost you the same
The new gearbox you get from bmw comes with m4 internals and is way stronger than your original box
When I got mine from bmw and done a check on the s/n, it matched to an early m4 box
the old 135i box is light years behind the new box in terms of smoothness, cold shift and general driving. The difference is like jumping out of a car into a truck
Our gearboxes have a dry sump type system in them which uses 1.5 litres max and lubricates the gears better the the oil filled original gear box that runs 4 plus litres
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Ended up doing the swap. Cost me $1000. Noticed zero differences between the smoothness of shifting the trans.