newbie rearend question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RapidRide2 · 10-08-2005, 01:08 PM

I spotted a 10-bolt 3.73 locking rearend at a local salvage yard. It is in a 86' chevy suburban 1/2 ton 2wheel drive with a 4-speed automatic. I have an 83'gmc 1/2 ton 2 wheel drive with a 10-bolt 2.56 open rear end with a 4 -speed auto. My question is will this rearend be a direct swap,,,any differences??? yoke and all??? or will there be some minor mods involved???? they want $250.00 the rearend is clean and complete thats about all i can say or know about it. Is this a bad price??? anything else to check???

red86chevy · 10-08-2005, 01:30 PM

I'm pretty sure that it would be a direct swap. Is it posi? If not it sounds kinda expensive to me. I bought a 12 bolt for my '86 non-posi with a 3.42 gear, brakes and drums for $75.00

JMO,
Jeremy

SSC's76 · 10-08-2005, 01:31 PM

10 for 10 it's failry simple. Of course you will need to re calibrate your speedometer after the gear swap.

RapidRide2 · 10-08-2005, 01:33 PM

yes it is a limited slip.

RapidRide2 · 10-08-2005, 07:31 PM

I Got The Rearend Today,,, I Got It For $175 After Talking To A Different Guy At The Yard.

72 CustomCamper · 10-08-2005, 07:59 PM

if it's a stock rear it's more than likely a Gov-loc diff. Not known to be the best or strongest diff...

Chuck

RapidRide2 · 10-08-2005, 09:09 PM

How Can I Tell If It's A Gov. Lock????

72 CustomCamper · 10-09-2005, 12:58 AM

The best way is to remove the rear cover and see if it looks like this...

Chuck

SSC's76 · 10-09-2005, 10:40 AM

Yea but even if its a grenade lock you still got a good deal on a complete rear end with a much better gear set. Now before you go trying to lay down dual rubber marks remember all the peices in 72's pic like to explode when you abuse one of these, or get stuck in snow, or sand and lets not forget wet or icy roads.

RapidRide2 · 10-09-2005, 07:36 PM

my anemic 305 is only putting out 160 h.p. right now and the most it will ever put out is around 275 for everyday driving. I now understand now ,,, i do have the gov. lock,,,however i really don't hear of alot of these going out with as many trucks and suburbans are on the road??

**N2TRUX** · 10-09-2005, 08:00 PM

For the average driver, in a 2wd truck there is nothing wrong with a Gov-Lok. In a 4wd, or standard shift truck that gets beat on they are prone to failure. I suggest changing the gear oil and enjoy the 3.73 gears. You might be able to sell your old rear end and recover some of your costs....

10-08-2005, 01:08 PM	#1
RapidRide2 Registered User Join Date: May 2004 Location: Saint Louis Posts: 76	newbie rearend question??? I spotted a 10-bolt 3.73 locking rearend at a local salvage yard. It is in a 86' chevy suburban 1/2 ton 2wheel drive with a 4-speed automatic. I have an 83'gmc 1/2 ton 2 wheel drive with a 10-bolt 2.56 open rear end with a 4 -speed auto. My question is will this rearend be a direct swap,,,any differences??? yoke and all??? or will there be some minor mods involved???? they want $250.00 the rearend is clean and complete thats about all i can say or know about it. Is this a bad price??? anything else to check??? Last edited by RapidRide2; 10-08-2005 at 01:12 PM.

10-08-2005, 01:30 PM	#2
red86chevy Registered User Join Date: Jun 2005 Location: sc Posts: 77	I'm pretty sure that it would be a direct swap. Is it posi? If not it sounds kinda expensive to me. I bought a 12 bolt for my '86 non-posi with a 3.42 gear, brakes and drums for $75.00 JMO, Jeremy __________________ 86 c-10 383 w/ sportsman II heads comp 286h cam Edlbrock RPM Performer intake Holley 750 th350 w/2400 stall 3.73 gears with powertrax No-Slip posi unit. Just broken in good. Will get a 1/4 time this week.

10-08-2005, 01:31 PM	#3
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	10 for 10 it's failry simple. Of course you will need to re calibrate your speedometer after the gear swap. __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

10-08-2005, 07:59 PM	#6
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	if it's a stock rear it's more than likely a Gov-loc diff. Not known to be the best or strongest diff... Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

10-09-2005, 12:58 AM	#8
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,368	The best way is to remove the rear cover and see if it looks like this... Chuck Attached Images __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

10-08-2005, 01:33 PM	#4
RapidRide2 Registered User Join Date: May 2004 Location: Saint Louis Posts: 76	yes it is a limited slip.

10-08-2005, 07:31 PM	#5
RapidRide2 Registered User Join Date: May 2004 Location: Saint Louis Posts: 76	I Got The Rearend Today,,, I Got It For $175 After Talking To A Different Guy At The Yard.

10-08-2005, 09:09 PM	#7
RapidRide2 Registered User Join Date: May 2004 Location: Saint Louis Posts: 76	How Can I Tell If It's A Gov. Lock????

10-09-2005, 10:40 AM	#9
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	Yea but even if its a grenade lock you still got a good deal on a complete rear end with a much better gear set. Now before you go trying to lay down dual rubber marks remember all the peices in 72's pic like to explode when you abuse one of these, or get stuck in snow, or sand and lets not forget wet or icy roads. __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

10-09-2005, 07:36 PM	#10
RapidRide2 Registered User Join Date: May 2004 Location: Saint Louis Posts: 76	my anemic 305 is only putting out 160 h.p. right now and the most it will ever put out is around 275 for everyday driving. I now understand now ,,, i do have the gov. lock,,,however i really don't hear of alot of these going out with as many trucks and suburbans are on the road??

10-09-2005, 08:00 PM	#11
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	For the average driver, in a 2wd truck there is nothing wrong with a Gov-Lok. In a 4wd, or standard shift truck that gets beat on they are prone to failure. I suggest changing the gear oil and enjoy the 3.73 gears. You might be able to sell your old rear end and recover some of your costs.... __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"



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