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Old 07-10-2012, 12:58 PM   #1
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Join Date: Feb 2007
Location: acton
Posts: 109
Which Gearing do i have

IS there anyway to tell what gearing i have without taking the cover off. It had a 2 speed powerglide originally

Im hoping for 373
1967 C10 Long Bed, Soon to have a 350
1997 Chevy 2500 454 BB
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Old 07-10-2012, 01:26 PM   #2
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Join Date: May 2012
Location: Xenia, OH
Posts: 65
Re: Which Gearing do i have

It's not the most accurate way, but you can jack up the rear and spin the rear tires together and count the revolutions of the tires vs the revolutions of the driveshaft. Tires doing one full rotation vs driveshaft doing just over three is normally 3.07, just over 3 1/2 is usually 3.55, just under 3 3/4 is 3.73 and over 4 is 4.10. Again, it's not the most accurate as you've got driveline slack and open differentials to deal with.
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