I've been reading up on this subject all day and I can't decide what I want to get. I'm an automatic GT. Would the 4.10's be ok if I supercharged it? I don't want to buy the gears and then end up switching a little down the road. I also read somewhere that 3.73's on an auto are like 4.10's on a manual.

 

I went 3.73's as I was planning going with a supercharger. The speedshop that did my work stated if I was planning on going F/I that 3.73 would be plenty. The car is going to Brenspeed next week for the Paxton installation. Good luck!!!

 

http://forums.bradbarnett.net/showthread.php?t=67040

 

I'm NA but the general consensus seems to be, if you have 4.10s + power adder you'll rev through your powerband too quickly to harness the power of the sc...most people on this forum are running 3:73s or taller with turbo/sc...

 

Thanks for all the info guys, and thanks for the link howarmat, that is an awesome deal.

 

I got 3.73s and sometimes it feels as if I can't shift fast enough. With my S/C the rpms come real quick in first and second gears. I think 4.10s would be way too low if your gonna Supercharge.

 

Nobody will ever know the answer to this question, you could ask a thousand different people and they would all have different answers on why to get a different gear ratio.

Personally id say 3.73s, but all depends on what you will be doing

 

The "Rule of Thumb" with an automatic is:

3.73s if you supercharge and 4.10 if you don't...

Dave

 

Saleens run with 3.73's for a reason...(I don't know what that reason is - but they do)

 

If you can't make up your mind, try a 3.90