The 1947 - Present Chevrolet & GMC Truck Message Board Network

The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)

- - gear ratio calculator (https://67-72chevytrucks.com/vboard/showthread.php?t=283365)

J/D/S

03-16-2008 09:43 PM

gear ratio calculator

Is there anyware I can find a calculator to find out what my final drive ratio is?ie if I have 3:08 and 18 inch rims my ratio is blah blah.

moneyeater

03-16-2008 11:23 PM

Re: gear ratio calculator

Try 73-87.com.Its the great site from boardmember bigblock73 (friends call him Jeff)!You´ll find all kinds of usefull stuff around the squarebodies!
Moneyeater

DubDubU

03-17-2008 12:25 AM

Re: gear ratio calculator

http://www.rcuniverse.com/community/gearwizard.cfm

piecesparts

03-17-2008 04:12 AM

Re: gear ratio calculator

You want to know the gear ratio.
You will need to know the diameter of the tires, the type of tranny output ratio (OD will be approx. .70 a NON OD will be 1.0)

take the problem and do this calculation RPM X Tire Diameter (Divided by) MPH X Trans Output ration X 336 = Gear ratio.

Example: 2500 RPM X 29" tire = 72500 70 MPH X 1.0 X 336 = 23520 72500 divided by 23520 = 3.08 gear ratio

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