Which rear end gears for TH400
Thread Starter
Staging Lane
Joined: Jun 2004
Posts: 90
Likes: 0
From: Conway, AR
Which rear end gears for TH400 What do all the "DRAG ONLY" cars use for their rear end gear ratios?
My car is a Big shot nitrous car that will be spun to approx. 7k rpms.
Preferrably like to the tires I already have (28") would I need to change that also.
Gears in the 9" are 4.30's
Dane
My car is a Big shot nitrous car that will be spun to approx. 7k rpms.
Preferrably like to the tires I already have (28") would I need to change that also.
Gears in the 9" are 4.30's
Dane
7 Second Club / STF Veteran
Joined: Nov 2003
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i'd leave the gears alone. unless you plan on trapping over 135mph. if so you could go to a 29" tire which would let you hit 140 with your 7k ceiling. go to http://www.speedworldmotorplex.com/calc.htm
to try out different tire heights and gear ratios till you see what you want.
to try out different tire heights and gear ratios till you see what you want.
Thread Starter
Staging Lane
Joined: Jun 2004
Posts: 90
Likes: 0
From: Conway, AR
Thats a good question that I dont know the answer to. I have no idea what my car will mph in the 1/4. I would hope to think that it would mph 135 no problem. Looking 2 make near 800rwhp on the bottle.
I would like to leave the 4.30's in there since they are already set up.
Dane
I would like to leave the 4.30's in there since they are already set up.
Dane
i think a step down to a 3.73/3.90 would be good to stay on the 28" tire. I just like allowing myself some extra room. I'm in the same situation with the same gears and going to a 3spd trans as well(TH350).
Chris
Chris
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Verdad Gallardo 7 Second Club / STF Veteran
Joined: Nov 2003
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with that you should only see 650-700 at the wheels. is your 350 estimation based at 350whp of nitrous or just a 350 shot? also should and will are two different things. good luck but i would leave the gears alone till you find out what you're crossing the traps at.
Originally Posted by 68maro
but i would leave the gears alone till you find out what you're crossing the traps at.
