Hi all, Have also posted this on other forums but so far no-one seems sure.
I've got a manual 1990 H reg e34 520i which is an early m50 engined car. This means it has the "fitted for three months only" so called overdrive gearbox & 4.27 differential.
Problem is, my diff is now quite clunky & because it was only made for three months appears to be quite rare. The later diffs are far too tall gearing wise at 3.46 but the earlier m20 engined e34 520i diffs are listed as 4.44 which is much closer to mine (in fact would be a better ratio as I feel it could do with slightly lower gearing).
I just want to know whether the earlier diff will fit & bolt up to the prop without any problems & if anyone on here has tackled this swap before. I believe that cars fitted with autoboxes have a different prop flange on their diff which can be swapped over at a push but there are issues with torqueing it back up correctly so I would prefer to try to source a manual one if it would be a simple swap.