Thread: gear ratio help

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350/350 at 2500 rpms,running 65 mph with 26" tires what are my rear end gears?

Originally Posted by plumpurpleplym

350/350 at 2500 rpms,running 65 mph with 26" tires what are my rear end gears?

My guess would be 3:42. I have 3:42 in my 66 305/350 with 28" rear tires 2200 2300 was 65mph.

Figuring it out with NO slippage from the torque convertor the ratio is 2.976.

Dedending on how tight or loose the convertor is it would be in the 3.00-3.10 range.


dlotraf33 you might want to check your tach, speedometer or gear ratio. With the 28 inch tall tire and 3.42 gear your RPM at 65 would be in the 2700 RPM range (2668 RPM without any convertor slippage taken into account).

thanks for the input guys.I'm sure ther's a formula to get really close on the gears but i had no idea where to find it.thanks again.

Here are the links to the calculators I most use. It's the place I start almost all of my builds.

Engine rpm http://www.mustangii.net/rpm.asp

Gear Ratio http://www.mustangii.net/gear_ratio.asp

Tire Diameter http://www.mustangii.net/tire_diameter.asp

This link has pretty much any kind of formula you would ever want including the one your asking for:

http://www.csgnetwork.com/automotiveconverters.html

Mike and Gary, thank you very much for the calculator links. I have added them to my favorites.

thanks for the web sites,i knew you guys could help me out.thanks again.