318ti.org forum - View Single Post - Diff. swap question?

If bolting on is the issue, it turns out many diffs fit without modification. I personally think you should not go higher than the stock manual tranny ratio (3.45), if you are planning on adding a supercharger/turbo. Staying with a stock 3.45 Ti diff seems questionable with a supercharger; get a widebody (6 cylinder) diff.

Quote:

Originally Posted by Panzer_M

go with a 3.45 Ti Small case diff or e30 3.73 LS or 3.64 LS which are the larger case diffs, but bolt up the same with the Ti.

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1998 (July) 318ti, 5-spd
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