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**lolife99** · 03-19-2010, 01:57 PM

Sounds like you have 4.10's.

Look here:
http://www.ringpinion.com/Calc_RPM.aspx

4.10 gear
27" tall tire
80 mph

Comes out to 4082 rpm's.

03-19-2010, 01:57 PM	#226
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,717	Re: Air Ride Install - '69 Chevrolet SWB Stepside Sounds like you have 4.10's. Look here: http://www.ringpinion.com/Calc_RPM.aspx 4.10 gear 27" tall tire 80 mph Comes out to 4082 rpm's. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 03-19-2010 at 02:30 PM.