First off a big thanks to all the posters here. Its always been a crucial part to any research I've done for my Camaro/Birds. Recently I've been looking at rear end gears and never found a calculator like I liked so I made this one up today at work. It is an excel spreadsheet that will make a nice graph of all your gears and their mph/rpms.

Instructions

1. Only use the first page unless you are purposefully editing my formulas. The 2 and 3 sheet are for calculations.

2. Enter in your tranny gear ratios. For a 5 speed car just put the same number for 5th and 6th.

3. Enter your rear gear.

4. Enter your tire size.

I think I have the sheet saved with T-5 info + T-56 6th gear. I'll continue to make some improvements to the sheet. Enjoy and let me know if you have any problems.

http://www.4shared.com/file/24272574...alculator.html