why not just get a diff out of a 325i 5speed or M3? i dont know about e36's, but the e30 4cyls used a small case diff that would not fit nor withstand the torque of the 6cyls. but just in case, do you know the final drive ratio of the 318i 5speed diff vs. the 325i auto?
The diff from a 318i WILL work on a 6 banger because I had it done before I bought a diff for a 6 banger. I would not recommend it because you will be rev'ing high and your gas will be sucked up like no tomorrow!
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Body: 318i 4 door
Mods: M50 engine, Jim C chip, light-weight flywheel, dual cat-back custom exhaust, 3:15 lsd, euro headlights w/angel eyes, 5300K HID, smoked corner lights, FK Motorsports foglights (crystal clear), ABS plastic upper eyebrow, clear side markers, M3 powered side mirrors w/LED, blacked out grill, M3 lighted shift knob, 17" ROH Furry wheels w/Kumho tires, Brembo cross drilled rotors and Hawk performance brake pads all around, PSS9 Bilstein and H&R coil over kit, front strut bar and Alpine alarm.
The 6 cyl diff will work on the 318 for sure. I've seen it done many times. However, I'm not sure how the gear ratios will be affected. Never swap an auto diff into a manual car! The gear ratios will be "race spec" close. I did this on my '92 318 which had a 3.45, I used an auto 4.44 and the top speed became RPM limited to only 160-170km/h. You'll put a lot of wear on the engine during highway driving. It's a lot of fun on the street because of the added "feel" of more torque.
Anyways, ask around to see what other differentials will work well with your car. But the 318 diff has an even higher ratio than the 325, so I would strongly recommend against it.
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