rear-end questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

79GMC_OLDS · 03-27-2006, 03:09 PM

Ok i have a GM82 coded rear end. I found out the GM8 means 2.56 gears but i am wondering what the 2 means? Does this mean i have a 2 series carrier? Is it possible to put 3.73 gears in my rear-end or do i need a new carrier? It is a 12 bolt.
thanks

AWK · 03-28-2006, 11:27 PM

This site may help answer your questions http://www.oldsmobility.com/10bolt-tech.htm

**crossy** · 03-29-2006, 12:09 AM

the 8.5 posi units are very universal but unfortunately2.73 is the cut off point. 2.56 and lower(yes they made worse) is unit in itself but i guess a spacer is an option but i sure dont like em. DAVE

79GMC_OLDS · 03-29-2006, 01:01 AM

Ok well i bought a 3.73 12 bolt from a 74 today..thanks though

cliffsta · 03-29-2006, 01:45 AM

haha i have 2.56, yeah it's a dog but you can do like a million miles an hour in first before it shifts up, makes highway crusin' fun for us without OD

03-27-2006, 03:09 PM	#1
79GMC_OLDS Registered User Join Date: Feb 2006 Location: Ontario Posts: 145	rear-end questions Ok i have a GM82 coded rear end. I found out the GM8 means 2.56 gears but i am wondering what the 2 means? Does this mean i have a 2 series carrier? Is it possible to put 3.73 gears in my rear-end or do i need a new carrier? It is a 12 bolt. thanks __________________ 79 GMC Sierra 5.9 cummins, nv4500

03-28-2006, 11:27 PM	#2
AWK Registered User Join Date: Feb 2006 Location: Nova Scotia; Canada Posts: 7	Re: rear-end questions This site may help answer your questions http://www.oldsmobility.com/10bolt-tech.htm

03-29-2006, 12:09 AM	#3
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Re: rear-end questions the 8.5 posi units are very universal but unfortunately2.73 is the cut off point. 2.56 and lower(yes they made worse) is unit in itself but i guess a spacer is an option but i sure dont like em. DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

03-29-2006, 01:01 AM	#4
79GMC_OLDS Registered User Join Date: Feb 2006 Location: Ontario Posts: 145	Re: rear-end questions Ok well i bought a 3.73 12 bolt from a 74 today..thanks though __________________ 79 GMC Sierra 5.9 cummins, nv4500

03-29-2006, 01:45 AM	#5
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	Re: rear-end questions haha i have 2.56, yeah it's a dog but you can do like a million miles an hour in first before it shifts up, makes highway crusin' fun for us without OD __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord



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