Hey,

I have a 3.909 LSD Diff on my 87 5speed

I'm a fan of tall gearing with Boost but will have to give up my N/A tranny for a TII 1 after I turbo this motor. I'm looking for anyone that has had the Differentials appart and knows if it's possible to either swap the pinion gear of a turbo into an N/A housing or the Ring gear of an N/A with the LSD diff into a TII housing

Frank

 

if your car was always an auto it should have the same gear ratio as a turbo diff., 4.10.

 

No, that would be wrong. Auto tranny coupes came with a 3.9 rear end gearing.

 

No, they are not interchangeable. The Turbo uses a 8" diff and gear set, and the non turbo uses a 7" diff and gear set.

Replace the whole rear end if you want turbo or manual tranny gearing.

 

Damn.. oh well.. would have like to keep that Tall Gearing!

Thanks for the input Icemark


Frank

 

RXciting Pm sent to you.

 

my bad, i thought they were the same. though 3.90 to 4.10 is not much, doesn't anyone make gear sets for these axles? i haven't checked yet for lower gear ratios but i would be willing to bet you could find a good manufacture set of gears for it.


wow i guess you are right, they make plenty of short gear ratios for track but none for speed.

http://www.mazdatrix.com/g6.htm

i will have to check with some local pinion manufacturers to see if they know of any sets with a lower gear ratio...