This topic has been covered extensively in the appropriate subforums, however I'll go ahead and help you out. For starters, there's no such thing as a 328(2.8L) e30. I think you're confusing it with 325. Second, when swapping in a medium case e30 diff, no changes to the driveshaft need to be made. There's little if any difference lengthwise between the 318ti's small case diff and the 6cyl e30's medium case diff. Any difference in length can be compensated by the 318ti's telescoping driveshaft. E30 medium case diffs have a 4 bolt input flange which mates right up to the 318ti's driveshaft. The concerning difference between the two diffs is in the width. Medium case diffs are wider than the stock small case diff, thus requiring shorter halfshafts(axles). E30 halfshafts are the perfect length, the splines mate up to our hubs and the output flanges should have matching bolt patterns if the diff and halfshafts are both from a 6cyl e30.
Is your car a manual or automatic? Are you going to use the donor car's automatic transmission? |