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Old 05-26-2005, 08:32 PM
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GM gear ratios and how they work??

the gearing allway screws with my head, correct me if i am worng

4.10s are more for towing.. lower top speed but will get the tire spinning off the line and would get up to speed fairly fast

then as you go to lower gears 3.73 ect... i would get a higher speed but it may take me a little more time to get there

is this right?

I have a 88 chevy c1500 the tire size is 275/60/17 how can i find out what gears it may have?

what is a good gear ratio for street/strip?


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Old 05-26-2005, 08:43 PM
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for purposes of argument, we'll assume you're in 3rd gear with a 1:1 ratio in the transmission.

The number represents the number of times your engine has to turn over to turn the wheels one time. A 2.52 gear the engine is creeping along because it only has to spin 2.52 times to get the wheel to turn over once. A 4.10 gear the engine has to spin almost twice as much, so its working faster all the time, although there is less total stress on the engine crank with a steeper gear. IF the engine gets to spin more times for each tire revolution, it can apply power more quickly to the road. If it spins fewer times, it will apply less power over a given distance, but will be doing less work at a crusing speed, and give better gas mileage.

The gears in your transmission multiply the rear ratio, so with 3.73 gears and first gear in a TH350 trans (2.52 first gear) you're spinning something like 9 times per tire revolution, and 3.73 times in your final third gear (1:1).

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