Quote:
Originally Posted by E30ROB
And to answer the question of why the large case 135i diff into a 128i, that was not the original plan.
The only gamble I knowingly took was the difference in driveshaft flanges, I wasn't expecting to receive a 215mm differential, but I will explain that below..
When I ordered the diff for a 135i a/t I was under the impression ALL automatic 135i's came with a 188mm differential. Sadly that wasn't the case, and ECS sent me a 215mm differential.
After receiving it and finding out it was a 215mm i would have had to spend $300 on shipping at the end of the day after getting the correct 188mm size diff so I decided to find out if it might work.
My research proved it will fit into the chassis and the only issue was the driveshaft flange.
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So now you are really screwed...... there are no large pumpkin halfshafts with small spines axles. 128s have small splines at the hubs. Your axles are longer for the small diff.
Good luck ��
I went through this when I did the full 135 rear swap on mine to retain the ebrake. I have 135 hubs and brakes. The rear axles are 335 auto axles mating to 128 rear diff. The 128 axles are worthless and offered on 325 cars also. The small spline outboard are for the lower hp cars to reduce weight to match the small diff.
If you need I have set of lci 3 series hubs with ebrakes/rotors/calipers available, but then you would need short(manual 335 axles)