Ok, the car is a drag car, driven on the street less than 3 times a month. Ive got a Moser 9" w/ 3.70s, TH-400 w/ 3800 stall and a transbrake and 26" tall tires. Running stock heads and a 228/232 cam my best et has been 11.6s on 3455 race weight. I have to shift around 6200 with that cam. Im not happy with shifting at 6200. I wanna go all the way to 6700-6900. Is the Trex what I need? If I get this Trex, do I need to go to a 28" tall tire? change rear end gearing? Thanks

Josh

 

Yeah, the t-rex needs to be shifted at 6800-7000 to net the best times.

 

so it would definately be a good addition to my setup...even though its a th400 and not a 6 speed

 

I would think so. It doesn't "peak" as high as people make it sound, but it carries its power for quite awhile. You would probably want a numerically higher gear ratio, as well.

Josh

 

The Trex typically peaks around 6800 and carries well into 7400 RPM. Yes you will benefit from gears with this cam as well, 4.10's minimum I would say and probably loves 4.56's..

Dan

 

4.56's in a TH400 huh....

 

ya thats what I say on a th400.good luck.using a 28x12.5x15 et streets here.

 

Sorry guys, another brain fart for me, didn't even take in it was a TH400. Still think 4.10/4.11's would work well for the TH400 setup, same as what my bro used to run..

Dan

 

so probably use 4.10/4.11 with a 28" et drag and shift around 7k?

 

I think most people have had the best results shifting around 7200. I would think 3.90's to 4.11's should be pretty good for gears. You'd probably see some ET improvements with a 4200 or bigger stall also.