I have an e36 323 188 medium case differential as a doner
for the 3.91 crown wheel and pinion I have bought.
It was advertised as medium case fitment but I've run into a
little problem while putting it all back together.
First I must explain that the work is being done by a gearbox and
diff engineering shop and they are great at what they do.
They have said that the ring fits perfectly but there is about a 3mm
space where the two engage together which should be closer.
They've asked if there is supposed to be some kind of spacer or is there
something else we're missing? They think it could need a smaller case?
Please could anyone that's handled a change like this give me some advice,