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FMD · 01-19-2009, 07:05 AM

Yeah this doesn't make any sense...

I searched on realoem.com and it says the rear subframe part numbers for the 1985 318i (small case diff), 1991 318is (small case diff), 1985 325e (medium case diff), etc. basically the e30s all have the same subframe... Therefore, the bolt patterns (where they mount to the subframe) on the diffs should be identical and can be interchanged with this respect.

Also, people on this forum have not reported any issue with swapping the medium case e30 diff into the ti or have any problems with aligning the bolts of the diff with the subframe.

Therefore, the small case diff from a 1985 318i should theoretically have no problems with mounting onto the subframe.

Yet there's around a 8mm spacing difference between the carrier bolt pattern of the diff and the subframe holes.

wtf? Is this some kind of mutant diff or something?

01-19-2009, 07:05 AM	#2
FMD Senior Member Join Date: May 2005 Location: Seattle Posts: 181 iTrader: (0) Photo Gallery	Yeah this doesn't make any sense... I searched on realoem.com and it says the rear subframe part numbers for the 1985 318i (small case diff), 1991 318is (small case diff), 1985 325e (medium case diff), etc. basically the e30s all have the same subframe... Therefore, the bolt patterns (where they mount to the subframe) on the diffs should be identical and can be interchanged with this respect. Also, people on this forum have not reported any issue with swapping the medium case e30 diff into the ti or have any problems with aligning the bolts of the diff with the subframe. Therefore, the small case diff from a 1985 318i should theoretically have no problems with mounting onto the subframe. Yet there's around a 8mm spacing difference between the carrier bolt pattern of the diff and the subframe holes. wtf? Is this some kind of mutant diff or something?