Re: rear diff change to 3.46?, 3.73? (cost) (archive)

I was not cheap. You can go to the Korman Autoworks site and get the up to date parts prices. I had Korman Autoworks do it back in 1995 & 1997 . As near as I can remember. The Quaiffe was $1700--gear new $650-- Labor for all around $800. . Prices are probably more now. There was some machining done to make a good fit for all the parts. I am lucky because now my son can do the Job for me. One thing good is that the Quaiffe can be saved when you are through with the car. The eviedently last forever. SOOO be sure and save your old LSD to put back in the car when you sell the car. The way I did it was to have a used diff and use the case for the new setup and save my old diff to put in the cat when it is sold. Much better than taking anything apart when you need to unload the car.
holly
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How much does something like that cost? I was thinking about that but have do idea about cost of parts and labor.

Thanks,

Eric

I did this ( 3.46) with my '97 M3 & my '94 325is-- all I can say is wow. I also had a 3.93 in my is way too short 1st, 2nd & 3rd .I plan to put a 4.46 in my Z3 my Z3 3.0 eventually. Really changes the accelleration but not the top end.
holly

Anyone done the diff upgrade?
my buddy just put on 265/40 on the rear and 235/45 on the front...the new rear tire size effectively changes the rear end ratio to a 3.15

now he's thinking about getting a Quaife diff with a 3.46 or 3.73...which would end up being an effective 3.37 or 3.64 because of the tire size...

just wondering if anyone has done it already and their comments on the performance...

thanks,
rukman

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