rpm formula

[black00ws6]

anybody have the formula for rpm when changing rear end ratios with an auto trans? thanks

[fastTa]

Here is a decent collection of easy to use calculators:

http://murray.faithweb.com/formulas.htm

[black00ws6]

thanks for all the help

[fastTa]

Just so you know, the final gear ratio of a 4L60E is .699. If the online calculator you are using does not allow 3 decimal places, you can just use the commonly used .7. It will get you plenty close.

[black00ws6]

thanks again

[black00ws6]

gear swap to 1/4 mile time

i have a 00 ws6 auto what will i gain in the 1/4 if i swap out the 3.23 for 4.10