Differential Question... - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 05-31-2004, 12:15 AM
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Will a 94 318i manual differential work on my car which is a manual 95 325i?

The problem I'm having is my rpms are a little high with my old auto transmission differential and is kind of annoying during highway driving. do you think this will solve my issue or not?

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#2 (permalink) Old 05-31-2004, 12:38 AM
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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?
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#3 (permalink) Old 05-31-2004, 03:27 AM
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The e36 diffs are the same way. 6s wont work on 4s, and vice versa.

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#4 (permalink) Old 05-31-2004, 11:20 AM
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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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#5 (permalink) Old 05-31-2004, 11:26 AM
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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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#6 (permalink) Old 05-31-2004, 06:03 PM
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thanks for the help everyone.

I guess I'll buy an m3 one on ebay...

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#7 (permalink) Old 05-31-2004, 06:26 PM
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Thats interesting. Everything I have seen says the 6cyls are not workable on the 4. I'll have to start looking into that sawp again.

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#8 (permalink) Old 05-31-2004, 08:22 PM
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Quote:
Originally posted by jrhaile@May 31 2004, 05:43 PM
thanks for the help everyone.

I guess I'll buy an m3 one on ebay...
you may actually lose acceleration with a M3 diff compared to a 325i manual because i would think the more powerful engine would have taller gearing, but you would gain better highway gas mileage.
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