Which Gearing do i have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

byates2 · 07-10-2012, 01:58 PM

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

Beersnob · 07-10-2012, 02:26 PM

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.

07-10-2012, 01:58 PM	#1
byates2 Registered User Join Date: Feb 2007 Location: Acton Posts: 158	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

07-10-2012, 02:26 PM	#2
Beersnob Registered User 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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