T-56 viper box behind 545 cobra

[RICK LAKE]

AC-460 With the torque your 545 is pushing and the rearend change to 3.54, you are getting into running on the edge. The T-56 needs some help with forks, main shafts and 1-2 gears set. Go to G-Force and look up the kit to do this. They up the torque and HP rates to 800HP and torque with better input shafts and cluster of gears. Not cheap, but will hold up over long term. You didn't say what you are doing with the car, racing, autocross, show and shine?? Going to a 3.54 and having a what first gear ratio? First gear in any trans with a 3.00 or higher is never used and a waste of time. I have 3.31 and don't use first with a 3.06 custom trans. Down the road I may drop the rearend to a 3.07 ratio. The problem is the lower the gear you go the weaker the carrier in the Jag rearend is. I have a 2.88 as backup If I go racing and blowup the 3.31. I also would change the rearend to the 2.88 with the 6 spd richmond and be OK. I run pilot tires, no slicks, drag radials, autocross tires or Billboards. I would also tell you to look into the new Richmond super street 5 spd. It is more stronger and better designed to handle your power plant. The gears are straight cut and not heli gears with a 20-30 degree angle. Little more info would really help with your questions. Rick L.

[Powershift1038]

The T56 in a 2003/2004 SVT Cobra can take the kind of power you are making, and more. My '03 Cobra is currently at 450 rwhp with 461 tq. I have a new Whipple supercharger (and supporting mods) waiting to go on.. pushing me to 600 rwhp. I have NO fear of any trans failures. There are also numerous '03/04 Cobras owners who are running large single turbos.. making 750+ rwhp with the T56. The only trans mod I, and others making big power numbers, have is swapping to a 26 spline input shaft for added strength. It's probably easier to find a Cobra T56 vs. a Viper box too.

[AC-460]

I run the car on the road and on the track. My first option was to go for TKO600 and run a 3.31. Then I found that quicktime where making a bellhousing to take the TUET 1806 t56 viper box. With a .50 6th and 3.54 gears I can run 70mph at 1600rpm and have the 3.54 diff for mind blowing accelaration in the lower gears or should I just stick to the TKO 600 also thinking of running an aluminium flywheel and a McCleod twin plate clutch

[Powershift1038]

Oh yea.. here are the different gear ratios for both transmissions...

'03/04 Cobra T56
2.97/2.07/1.43/1.00/.80/.62

Viper T56
2.66/1.78/1.30/1.00/.74/.50

[undy]

I had a 03 Cobra and the Viper spec T56 is a stronger unit, more than just a different input shaft. There were several of the other Cobra guys that were busting the T56s and replacing it with Viper spec units.


Dave

[Powershift1038]

I was just trying to throw out another option. For the 650hp and 650lb torque he is running... a Cobra T56 would be more than enough, and easier/cheaper to find.

[undy]

Originally Posted by Powershift1038

I was just trying to throw out another option. For the 650hp and 650lb torque he is running... a Cobra T56 would be more than enough, and easier/cheaper to find.

I agree.. A cobra weighing <3000 lbs there shouldn't be a problem. I do hate that blasted weak 10 spline input shaft though..