The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**Sheepdip** · 06-11-2019, 07:38 PM

You'll need your rear tire actual O.D. not the rim size. Just punch in your rpm 2200, speed 70 and tire O.D. and hit calculate...... will then give you a close ratio.

https://speedmaster79.com/tools/gear-ratio/

06-11-2019, 07:38 PM	#2
Sheepdip Senior Member Join Date: Nov 2018 Location: Waterford California Posts: 2,365	Re: Rear end ratio help? You'll need your rear tire actual O.D. not the rim size. Just punch in your rpm 2200, speed 70 and tire O.D. and hit calculate...... will then give you a close ratio. https://speedmaster79.com/tools/gear-ratio/