Gear Ratio Help? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mcgwirejh · 03-13-2005, 01:59 AM

canyone tell me what gear ratio i got in my glove box on the parts id its says rear axle-standard?

Gyva · 03-13-2005, 02:23 AM

break open the diff case it'll be stamped on the ring, best way to check incase someone has swapped them already on ya..

Mike

**Stocker** · 03-13-2005, 11:36 AM

If you open the diff, you can count the teeth on the ring & the pinion - divide the ring by the pinion and that's it. Or just jack up the back of the truck and rotate a tire one full turn while counting driveshaft revolutions, and that's your gear ratio. Unless you have an open diff - in which case you multiply the shaft revolutions x 2. Or rotate the tire twice.

Truckstuff · 03-13-2005, 12:53 PM

Quote:

Originally Posted by Gyva

break open the diff case it'll be stamped on the ring, best way to check incase someone has swapped them already on ya..

Mike

Heres what your looking for. Just divide. This one is 3.727 (3.73)

Ratpowerd67 · 03-13-2005, 11:53 PM

is that carrier chrome plated, or is that just the way the pic turned out?

Truckstuff · 03-14-2005, 12:02 AM

Its just the way the pic turned out.

03-13-2005, 01:59 AM	#1
Mcgwirejh Registered User Join Date: Nov 2003 Location: Midland Tx Posts: 185	Gear Ratio Help? canyone tell me what gear ratio i got in my glove box on the parts id its says rear axle-standard?

03-13-2005, 11:36 AM	#3
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,572	If you open the diff, you can count the teeth on the ring & the pinion - divide the ring by the pinion and that's it. Or just jack up the back of the truck and rotate a tire one full turn while counting driveshaft revolutions, and that's your gear ratio. Unless you have an open diff - in which case you multiply the shaft revolutions x 2. Or rotate the tire twice. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

03-14-2005, 12:02 AM	#6
Truckstuff Registered User Join Date: Dec 2003 Location: Cloverdale, British Columbia Canada Posts: 159	Its just the way the pic turned out. __________________ Real Trucks are Built not Bought Building: 1981 GM SB LowRider 1985 GM K3500 3+3 1981 GM K2500 SSB 1980 GM K2500 X-BC Hydro 1979 GM K3500 3+3 1976 GM K5 Blazer 1970 Custom 10 http://bc4x4.com/

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03-13-2005, 02:23 AM	#2
Gyva Registered User Join Date: Jan 2005 Location: Mountain Home Idaho Posts: 544	break open the diff case it'll be stamped on the ring, best way to check incase someone has swapped them already on ya.. Mike

03-13-2005, 11:53 PM	#5
Ratpowerd67 Registered User Join Date: Aug 2002 Location: Trenton ,Texas Posts: 328	is that carrier chrome plated, or is that just the way the pic turned out?



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