In Reply to: Info for Guy Simpson - Diff source posted by Andrew on April 10, 2001 at 02:15:08:
No personal experience with this guy. Ad pasted from Roundel classifieds.
Differentials: used/custom; free consultation! 3.91 lsd; 3/5/6/7 Ser. 3.46
lsd, 3.25 lsd, 3.73 lsd, 4.10 lsd, 4.27 lsd, & 4.44 lsd; 540i 3.25 open,
rebuilt $1,495. Armand: 215 462-2996. (PA)
Where did you get 3.91 gears from? Pre 92 had 3.15LS and post 92 had 3.64? There is one 850 owner who is currently claiming he can install a 4.10 diff from a 535, which series I do not know, but I don't know if the work has been completed.
I assume you do know 850/750 final drives are interchangeable. 850's come stock with a non limited slip 2.9 something and the desireable diff comes from the pre 92 750.
How much more accelleration are you looking for? Have you tried a high stall converter yet?
I want to put 4.10 or even 4.3 gears in my 750. Now it has 3.91 in it and feels like I can go even lower for quicker acceleration.(This will be experimental,if too radical,I will go back to the 3.9's)
Does anybody know who makes them? Will I have to go aftermarket, or is there another model that used this ratio that can be adapted?