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Old 04-01-2003, 05:42 AM
Bluepen's Avatar
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Post Gear ratio, confused

OK, I read a post somewhere yesterday but couldn't post cause I was at work, now I can't find the post. Anyway it dealt with finding the gear ratio by turning the rear wheel and it said something I didn't follow.
The post said to turn the rear wheel once and count the pinion shaft rotation, OK done that before, then it said to double that number to find the ratio. Don't follow that part?? I've always thought that one time on the wheel, count the pinion and thats the ratio. I tried it on the truck I'm working on ('46 Chevy Panel) with a narrowed 9", the pinion count was 1.75 so is the ratio 3.50?? If thats right thats cool cause I was going to put in 3.70's but I can live with the 3.50's <img src="confused.gif" border="0">

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Old 04-01-2003, 06:02 AM
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If both wheels turn then the ratio of wheel revs to drive shaft revs will be your gear ratio. If only one wheel turns (differential working) then you need to multiply by two to take out the effect of the differential. Worst case is when you turn one wheel and the other wheel turns the opposite direction - then the drive shaft doesn't turn at all!
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