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How or where do you find the gear ratios for your truck,like 392's or 4??"s?The lower the no. the lower the top end right?Thanks.
 

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How or where do you find the gear ratios for your truck,like 392's or 4??"s?The lower the no. the lower the top end right?Thanks.
They are usually stamped on the differential.

Or, you could request a build sheet and it will tell you.

Or, you could jack up the rear end, while in neutral, mark the driveshaft, mark the wheels, give the driveshaft a few complete turns, and figure out how many times the tires turned....just ask for the build sheet:smileup:
 

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I got my build sheet and it will tell you everything you will need to know.
 
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