bebezote

for all the guys that have done t56 swaps...

with the c3...did you choose the ratios of the GTO (m12) or the f-body tranny ...and why please...??

just trying to make this decision..

I've got the LS1 going in with 27" tires and a 3.70 rear end.. i like that 5th ratio in the gto better so far...

also, what mods did you do and clutch?


Ratios:

F-body: 2.66 1.78 1.30 1.00 .74 .51
GTO: 2.97 2.07 1.43 1.00 .84 .57

Corey_68

Have an LS2 GTO T56 behind my LS2, personally I like its ratios.

As far as mods you'll have to modify the shifter, console, and tunnel for it to fit.

bebezote

thanks Corey !!

what kind of mods have you done to your LS2? what kind of hp do you have?

Corey_68

It's on the mild side for now as I shake it down. Only mods are a tune and headers, so somewhere in the 425-450hp range. You'll learn pretty quick when the reduction in weight these setups do not need a ton of power to be fast.

While my 468 big block dynoed at 632hp it was much more violent, I prefer this setup as crazy as that may seem. I'm willing to bet the LS2 is faster as its easier to hook up.

Gordonm

I also have a T56 from a GTO. I like the gear ratio spread with a 3.70 rear it works out very well. You can also use the LS style TO bearing which makes the install a breeze. You have to use hydraulics for the MC but I made up my own with a Tilton MC. Works great. I have an LS3 in mine but started with a roller cammed 383 GEN1 SB. Sold that motor and am now finishing up the LS3 install.

vette427-sbc

GTO here too... Love the gear spread. I think they have triple cone snychros like the C5 vette trans' do too