Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Different rear gear ratios = ??
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Old 06-23-2004, 06:06 AM
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The above post is only a vague response to your question, not explaining much and giving no REAL explanation.

So here goes.

Assume you have the following:

Any engine no matter the manufacturer, or size.
Any transmission, manual OR automatic with a final gear ratio of 1:1.
A tire size of 235/60/15. (This tire has a diameter of 26.1 inches)
Lets compare this information to a gear change.

gear ratio-...................3.23........4.11
engine RPM at 60 MPH-..2504........3186 (slightly above most engines' peak output, this does NOT include automatic transmission slippage factors)

top speed at 5000 RPM-..119 MPH....94 MPH (assuming engine is at peak performance at this RPM only, a lower peak WILL lower this number)

Torque at rear wheels assuming 200 foot pounds at pinion-
-.................................646'#........822' #

Changing nothing else, your vehicle will slow down with a higher ratio gear set.

Last edited by M&M CUSTOM; 06-23-2004 at 06:19 AM.
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