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Old 01-10-2004, 09:48 PM
bmwperson bmwperson is offline
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Location: Naperville IL
Join Date: Jan 2004
Posts: 42
Mein Auto: 723whp M3/M5/F30 335XI
Lightbulb differential swap 94 auto -> 92 stick

Hey, I recently crashed my 94 325i auto now I got a 92 325i stick... and since Im doing some suspension work I could swap the diff since 92 is lacking power at lower rpms.. Now i heard that autos have a higher ratio then stick for smother ride is that true? anyone knows what kind of ratios do 94 325i auto and 92 325i manual have?

Old 01-25-2004, 11:40 AM
nicko325 nicko325 is offline
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Location: Indiana PA
Join Date: Aug 2003
Posts: 24
Mein Auto: 94 325is
Hey. I had a forum with this same question. People will advise you against this because its nearly a 25% increase in gearing. But that also means a 25% increase in torque. Sounds nice. During highway use you will be seeing 3750 rpms at 70 mph. I think thats the number. Just multiply what you run now in 5th gear by 25%. The fifth gear is 1:1 so you can do that. The auto ratio is 3.91 and manual is 3.15. If you are intersted in performance and don't mind buzzing a bit on the highway its the way to go. Might want a LSD. I did it and love it. You may have to upgrade to the ZF tranny from an M type sooner or later with that torque. So there is another 550 bucks. I've done this and I don't regret it. There are others that have decided to do this with M3's and opted for the 6-speed. Prolly around $3000 for that. I haven't done that.

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