midwestjunk

iTrader: (2)

What factors come into play to choose the correct rearend gear? I may switch from a manual transmission to a TH400. my rearend is allready apart, I'd like to pick a gear that will work later on down the road. I dont want to tear down a rearend again in the following years to do a gear change. heres the basics of the car:

2000 camaro
race weight 3460 with driver and full bottle.
tires 28x10.50 hoosier slick
will eventually be a TH400 transmission
rearend is a moser 12 bolt
I can spin the motor to 7,200rpm.
this is a nitrous car.
car makes 600hp at the wheels on the dyno. may up the jets and make 700 eventually.

I found this richmond gears calculator on theyre webpage.

http://richmondgear.com/112901.html

It seems the 4:10 I have will still work. but I was told these calculators are not totally accurate in the real world. things like converter slippage come into play i have heard. I dont fully understand how the converter slippage works if somone can explain all this to me.

nocooler

iTrader: (5)

use tci's calculator to figure slip

http://www.tciauto.com/tc/racing-calculators

domestic disturbance

iTrader: (35)

4.10's would seem to work ok, will you be seeing 1/8 mile or 1/4 mile tracks mostly?

midwestjunk

iTrader: (2)

only 1/4 mile around here

midwestjunk

iTrader: (2)

with a 4.10 gear its 2.3% and with a 3.73 its 12%. why does the gear change the slippage so much?

nocooler

iTrader: (5)

You can only calculate slip from your existing setup. Then take the slip percentage and put it in the 1/4 Mile MPH Calculator by RPM, Tire Height, Rearend Ratio, Trans Ratio, & Converter. Then you can figure out which gears will be close. If you don't have a convertor yet - talk you the builder and see what they estimate the slip to be. A good converter will slip less than 5%.

4.10's should work with 28" tall tires unless you have 20% slip