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

chevy88 · 01-20-2010, 01:45 PM

I have a 1971, originally with 6 cylinder with three on tree, what should the rear end be from factory? As
I have jacked it up and turned wheel about 1 turn and driveshaft turned about 2 revolutions, which doesn't make sense? So I wire brushed the whole rear end down and got these numbers off the front GM55, 3896839N, and the back L61 or 81, then con2. Other than opening up rear end and counting gear notches do these numbers mean anything?

**CPNE** · 01-20-2010, 01:46 PM

1/2 2wd ton = 3:73
3/4 2wd ton = 4:56

IIRC the 4x4's are the same

01-20-2010, 01:45 PM	#1
chevy88 Registered User Join Date: May 2007 Location: Southern, Saskatchewan Posts: 640	rear end identification I have a 1971, originally with 6 cylinder with three on tree, what should the rear end be from factory? As I have jacked it up and turned wheel about 1 turn and driveshaft turned about 2 revolutions, which doesn't make sense? So I wire brushed the whole rear end down and got these numbers off the front GM55, 3896839N, and the back L61 or 81, then con2. Other than opening up rear end and counting gear notches do these numbers mean anything? __________________ Kerry My build thread. http://67-72chevytrucks.com/vboard/s....php?p=3657823 1971 Chev SWB with 68 nose, 6.2 diesel th350, and 3.73 rear gears 1988 Chev Extendacab 2010 Honda VT1300CS Sabre 2005 Buick Rendezvous wife's ride Last edited by chevy88; 01-21-2010 at 03:23 AM.

01-20-2010, 01:46 PM	#2
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Re: rear end identification 1/2 2wd ton = 3:73 3/4 2wd ton = 4:56 IIRC the 4x4's are the same __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all



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