RPM Calculator
 

This is the best RPM Calculator that I have found on the internet. Fun to play around with and enter various gears and tire sizes. It helped me determine Which rear ratio, transmission, and tire size to go with...

http://www.chevellestuff.com/tools/rpm_calculator.htm

For example...
Old Setup: 275/60/15 tires + TH350 transmission + 3.08 Rear @ 70mph = 2600 RPM
New Setup: 275/60/15 tires + 700r4 transmission + 3.73 Rear @ 70mph = 2194 RPM

Re: RPM Calculator
 

Here's another gearing calculator build for dodge cars that I sue alot

http://www.squirrelpf.com/gearingcalc/index.php

this is another cool one for comparisons

http://www.fatboyraceworks.com/gears/index.php

Re: RPM Calculator
 

Several years ago I made an Excel sheet that calculates RPM & Speedo gears based on tire size and axle ratios.

Re: RPM Calculator
 

Do you still have it? That would be great to circulate. I am not that great with excel.

Re: RPM Calculator
 

Here ya go. This is in Excel 97-2003 format.

I'd put an unmolested copy in a safe place before you change any values.
All of the Blue and Red numerals can be changed by hand without affecting formulas.

You can hand enter the tire diameter in inches but it will overwrite the formula in that cell.

The speedometer driven gears are automagically calculated from the tire diameter and the axle ratio.

Enjoy.

Re: RPM Calculator
 

4lo.com is better, can factor in crawl ratios....

Re: RPM Calculator
 

Ummm... Overall Gear Ratio and Crawl Ratio are the same critter. Cells C19-C30 and C37-C48. :lol:

All green rows have the splitter engaged... "1S" is 1st gear with a range splitter.
The Low Range Table has RPMs with the transfer case in low range.

Try changing Cell D10 from 1 to the Klune V Extreme Gear Splitter ratio of 4.1