Hello. I recently purchased an '89 e30 318 Touring mid-project from a guy in CA (the car is CARB certified) and am finishing what he started. I bought Rosie with all sort of goodies the previous owner purchased but never installed. One piece is a finned rear diff. Rosie came with a rear diff from a '98 z3 M & the Garagistic adapter kit & magnetic drain plug. So I realized last night that the 318 rear axle flange is a different diameter than the z3 diff, the z3 is about 3/4" greater. It looks as if everything should match up except for where the rear axle connects to the diff. Does anyone have the correct rear axles for sale?
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e30 318 Touring w/ e36 m3 engine - swapping original rear diff to '98 z3 m question
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RogueToaster- Thanks. I need to ID what I have and double-check that E30 med case flanges fit my needs.
I'll do some brief research, this one has been covered many times. I'll search Z3 diff swap, E36 diff, axle flange, diff splines...
Also, I realize that the Z3 diff is not really an upgrade but a ratio change and the fins are mostly for show as I'm the only one who will see them.
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A Z3 M differential uses the same black speed sensor as the E30 325i. A regular Z3 differential uses the blue speed sensor as the E36.Last edited by Vincenze; 10-20-2020, 08:41 PM.
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Originally posted by EastCoastErik View PostThanks.
I bought this speed sensor.
This one does. https://www.ecstuning.com/b-genuine-...r/62168355008/
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