Info on RPO G80 rear positraction axle! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

syncrov69 · 09-08-2009, 02:22 PM

I'd like to have info and picture on RPO G80 rear positraction axle. I have found two trucks with this rpo in glove box but I like toi confirm if it's a real posi axle. How to visually identify this parts and what is the check to confirm that the part work good. Thank's, François

Rod · 09-08-2009, 11:33 PM

Should look like this when you pop the cover off.

BCOWANWHEELS · 09-08-2009, 11:34 PM

yep that pic is a genuine eaton posi

BCOWANWHEELS · 09-08-2009, 11:37 PM

only way to check it is to do a burn out. you can jack up one side and try to turn it but best way is a burn out...
p.s.
might want to start out in some water, its easyer on parts.

syncrov69 · 09-09-2009, 04:36 AM

Ok thank's, now I have a non-posi (12 bolts cover) on my truck (1971 c/10 2wd) and is it possible to only change the carrier (parts circled on the picture) to transform my diff. to posi. Or better change only the posi parts (spring and plate) into the carrier and keep my carrier.

Tx Firefighter · 09-09-2009, 06:40 AM

Change the whole rear. The ring and pinion set up from the factory is right on the money. You will be way ahead to go that way rather than trying to re-setup the differential. It's a real pain.

By the way, G80 code is a long running option through different generations of trucks. You can look at an option sheet regardless of the year and if you see G80 on the list, it's a factory posi truck, even modern trucks.

syncrov69 · 09-09-2009, 06:48 AM

The truck is a 1972 and glove box spid indicate G80. It's impossible for me to take the whole rear because the outside are very rusted and for the interior it's a surprise too. The truck are in the wood since many year.

**lks dcvn** · 09-09-2009, 12:15 PM

Change the whole axle or just the innards over to an Eaton?

I will need to do this on my 2wd Blazer and would rather know now - what I will be up against - and what price I will suffer to find a whole posi rear axle.

09-08-2009, 02:22 PM	#1
syncrov69 Registered User Join Date: Aug 2007 Location: Laval, Québec, Canada Posts: 175	Info on RPO G80 rear positraction axle! I'd like to have info and picture on RPO G80 rear positraction axle. I have found two trucks with this rpo in glove box but I like toi confirm if it's a real posi axle. How to visually identify this parts and what is the check to confirm that the part work good. Thank's, François __________________ '71 Custom/10 Deluxe LWB '71 Custom/30 Deluxe Dually Last edited by syncrov69; 09-08-2009 at 08:33 PM.

09-08-2009, 11:33 PM	#2
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Re: Info on RPO G80 rear positraction axle! Should look like this when you pop the cover off. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

09-08-2009, 11:34 PM	#3
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Info on RPO G80 rear positraction axle! yep that pic is a genuine eaton posi __________________ I BELIEVE IN JOHN 3:16

09-08-2009, 11:37 PM	#4
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Info on RPO G80 rear positraction axle! only way to check it is to do a burn out. you can jack up one side and try to turn it but best way is a burn out... p.s. might want to start out in some water, its easyer on parts. __________________ I BELIEVE IN JOHN 3:16

09-09-2009, 04:36 AM	#5
syncrov69 Registered User Join Date: Aug 2007 Location: Laval, Québec, Canada Posts: 175	Re: Info on RPO G80 rear positraction axle! Ok thank's, now I have a non-posi (12 bolts cover) on my truck (1971 c/10 2wd) and is it possible to only change the carrier (parts circled on the picture) to transform my diff. to posi. Or better change only the posi parts (spring and plate) into the carrier and keep my carrier. Attached Images __________________ '71 Custom/10 Deluxe LWB '71 Custom/30 Deluxe Dually Last edited by syncrov69; 09-09-2009 at 04:38 AM.

09-09-2009, 06:40 AM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Info on RPO G80 rear positraction axle! Change the whole rear. The ring and pinion set up from the factory is right on the money. You will be way ahead to go that way rather than trying to re-setup the differential. It's a real pain. By the way, G80 code is a long running option through different generations of trucks. You can look at an option sheet regardless of the year and if you see G80 on the list, it's a factory posi truck, even modern trucks. __________________ I'm on the Instagram- @Gearhead_Kevin

09-09-2009, 06:48 AM	#7
syncrov69 Registered User Join Date: Aug 2007 Location: Laval, Québec, Canada Posts: 175	Re: Info on RPO G80 rear positraction axle! The truck is a 1972 and glove box spid indicate G80. It's impossible for me to take the whole rear because the outside are very rusted and for the interior it's a surprise too. The truck are in the wood since many year. __________________ '71 Custom/10 Deluxe LWB '71 Custom/30 Deluxe Dually

09-09-2009, 12:15 PM	#8
lks dcvn Registered User Join Date: Jan 2007 Location: Columbus, Ohio Posts: 4,348	Re: Info on RPO G80 rear positraction axle! Change the whole axle or just the innards over to an Eaton? I will need to do this on my 2wd Blazer and would rather know now - what I will be up against - and what price I will suffer to find a whole posi rear axle.

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