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Old 03-18-2002, 05:30 AM
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Cool rear gears n tire match

What is the formula for gear n tire combo's. Runnin a 64chevelle SS, totally lightened with a 350/400crank, flat tops, roller-roller, and my rear tires are 33x18x15. Want to run hard n lift with sliks, just playin, not into points. I know there is a formula for gear and tire size, where is it or what is it? Runnin a ford 9" with 3.25 gear now, think I need like a 4.60 not sure how it goes. <img src="confused.gif" border="0">

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Old 03-18-2002, 08:59 AM
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Talking

The formula that I use is from RICHMOND {FORMULA FOR SELECTING GEAR RATIO}
RPM X TIRE DIAMETER
____________________ = RATIO
MPH X 336
EXAMPLE- If you want to drive at 60 MPH at 2000 RPM and tire diameter is 30" the ratio would be 3.0.
2000 X 30"
____________ = 3.0
60 X 336

Hope this formula may help you in your gear selecton.


NONA JEFF
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Old 03-21-2002, 10:04 PM
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If you tell me how tall the tire is in inchs I can tell you what you want to know. ROY
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Old 03-22-2002, 09:09 AM
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Cool

What if your car is going to have an overdrive like my 57 with 700r4?
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Old 03-22-2002, 04:53 PM
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All the info put out is one to one so leave it in third gear to get your settings. ROY
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Old 03-22-2002, 08:16 PM
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You can check out Randy's ring & pinion web site at <a href="http://www.ring-pinion.com/calculators.html" target="_blank">http://www.ring-pinion.com/calculators.html</a>
He has all the formulas you are looking for. All you have to do is plug in your info and hit the calculate button.
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Old 04-09-2002, 03:47 PM
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Email me the information related to your car. I will not only give you gear ratio, tire and transmission information but I'll also predict the performance of the car and offer tips to inprove the performance.

pchotrod@hotmail.com

<a href="http://www.pchotrod.com" target="_blank">www.pchotrod.com</a>
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Old 04-10-2002, 03:39 PM
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Is this your e-mail address? mailto:tm53chev@yahoo.com

I just got a not deliverable for it. I can send you or post a "driveline calculator" which will allow you to substiture various wheel diameters and ring and pinion ratios. This will tell you what rpm's you would pull at various, speeds, ratios and wheel sizes. Maybe our moderator can tell us how to post an excel file.

However, this won't tell you how the car will run because if you don't have the torque to lift the wheels off the ground it is gonna stay on the ground.
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