what gears in the rear - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jtex1025 · 06-13-2004, 10:55 AM

how do i find out what gears i have in the rear please help

85gmcguy · 06-15-2004, 04:59 PM

The easiest way is to check for a tag/sticker on the glove box door or drivers door jam. The harder way is to pull the pumpkin cover and count the teeth on the ring gear and pinion gear and divide accordingly. You could count drive shaft revolutions to wheel revolutions for a ball park guesstimate.

cochran63 · 06-15-2004, 11:30 PM

My tag says "standard" rear axle. what was the standard gear ratio...2.73?

bluex · 06-16-2004, 06:09 PM

I remembered that when I put the LSD in my S10, stamped on the ring gear was a ratio. I dont remember what it was, but I just checked the '78 today and it was stamped on it too. Just take off the cover and rotate it around untill you see the numbers. There is a part number on it, GM and a ratio. Mine said 14:43. If you do the math that comes out to 3.071428....... or simply 3.08:1. Much easier than trying to count the teeth, b/c its really hard to see the pinoin gear without taking the carrier out. Then all you need is a gasket and 2 qts of fluid.

06-13-2004, 10:55 AM	#1
jtex1025 Registered User Join Date: May 2004 Location: corpus christi Posts: 21	what gears in the rear how do i find out what gears i have in the rear please help

06-15-2004, 11:30 PM	#3
cochran63 Registered User Join Date: Jan 2004 Location: Oklahoma Posts: 1,057	My tag says "standard" rear axle. what was the standard gear ratio...2.73? __________________ Youth soon passes away, but immaturity can last a life time.

06-16-2004, 06:09 PM	#4
bluex Registered User Join Date: Jun 2004 Location: Spartanburg, SC Posts: 1,963	I remembered that when I put the LSD in my S10, stamped on the ring gear was a ratio. I dont remember what it was, but I just checked the '78 today and it was stamped on it too. Just take off the cover and rotate it around untill you see the numbers. There is a part number on it, GM and a ratio. Mine said 14:43. If you do the math that comes out to 3.071428....... or simply 3.08:1. Much easier than trying to count the teeth, b/c its really hard to see the pinoin gear without taking the carrier out. Then all you need is a gasket and 2 qts of fluid. __________________ Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded '03 burb. Family cruiser http://upstategmtrucks.com/

06-15-2004, 04:59 PM	#2
85gmcguy Plays with trucks Join Date: Sep 2003 Location: Asheville, NC Posts: 433	The easiest way is to check for a tag/sticker on the glove box door or drivers door jam. The harder way is to pull the pumpkin cover and count the teeth on the ring gear and pinion gear and divide accordingly. You could count drive shaft revolutions to wheel revolutions for a ball park guesstimate.



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