8.5 rear end for 1980 G body GM

Chipper Chapman · 10-05-2013, 11:42 PM

77-96 b body are really close to direct bolt in other than width. upper arms need to be shortened and shock mount needs to be moved to rear of housing from front.

SSGN · 10-06-2013, 08:06 AM

Only the Buick Turbo Cars and Olds 442 came with the 8.5 inch. Monte SS and all others were 7.5. They are cheaper than a 12 bolt . I have seen non posi assembly's go for $500 or less. G80 is the posi code . Lyn go on here and look around, good bunch of guys

http://www.turbobuick.com/forums/

Kevin

Joe Toller · 10-06-2013, 02:03 PM

Quote:

Originally Posted by Chipper Chapman

77-96 b body are really close to direct bolt in other than width. upper arms need to be shortened and shock mount needs to be moved to rear of housing from front.

And, some b/c body are bolt-in axles. My 79 Lesabre came that way, shocked me!

Tod Lane · 10-06-2013, 09:50 PM

Quote:

Originally Posted by iraceitall

And, some b/c body are bolt-in axles. My 79 Lesabre came that way, shocked me!

Some Buick, Olds, Pontiac BOP Be careful some have some different internals, bearings...

Just had one in the shop, had to piece together a bearing kit.

Bobby Zlatkin · 10-07-2013, 09:19 AM

And don't be fooled by the left hand threads on the ring gear. By the time I realized the deal there, I had them suckers so tight they were almost impossible to get loose.

Oh well. As they say "live & learn".

CrateCamaro · 10-08-2013, 12:08 AM

I don't know about you guys but around here 8.5 10 bolts for G body are like hens teeth. I found a mint one in a scrap pile but that was sheer luck. And the fact that it came out of a friends turbo regal to install a 9 inch ford was even better for me. Probably cheaper and way easier to just go with a Strange or Mosier 12 Bolt. Way better tooling, thicker case, thicker tubes. All around better piece. Probably wouldn't matter in a stocker but gear selection for a 12 bolt is better then a 10 Bolt as well.

Greg Reimer 7376 · 10-09-2013, 10:57 PM

Seems to me that QA-1 offers adjustible upper trailing arms that have an offset for the purpose of installing an A body 12 bolt in a later G body car as a bolt-in.I bought stronger trailing arms for my '68 Chevelle wagon from them and got a catalog someplace. Their stuff is pretty nice, as well. While a 12 bolt is getting rather pricey, there is an excellent selection of gears and a small block car probably can't break it. Also I think someone makes an aftermarket bolt in 12 bolt housing now for the A body.

Logus · 10-10-2013, 10:05 AM

12 bolt A body rear in a G body. 2 more Cos. that make the rear arms.
Probably easier in the long run, than finding a GN 10 bolt laying around.

http://www.maliburacing.com/iceman/

http://umiperformance.com/catalog/in...&cPath=8_60_68

Lyn Smith · 10-14-2013, 09:59 AM

I found a couple places that make the adapter upper control arms for the G body 12 bolt swap.Do the lower control arms bolt up ok?

10-05-2013, 11:42 PM	#1
Chipper Chapman Member Join Date: Jan 2004 Location: Belmont N.S. Canada Posts: 473 Likes: 246 Liked 166 Times in 71 Posts	Re: 8.5 rear end for 1980 G body GM 77-96 b body are really close to direct bolt in other than width. upper arms need to be shortened and shock mount needs to be moved to rear of housing from front. __________________ Chris Chapman 1969 Chevelle NHRA F-G/SA 1090

10-06-2013, 08:06 AM	#2
SSGN Senior Member Join Date: Feb 2006 Posts: 644 Likes: 131 Liked 140 Times in 51 Posts	Re: 8.5 rear end for 1980 G body GM Only the Buick Turbo Cars and Olds 442 came with the 8.5 inch. Monte SS and all others were 7.5. They are cheaper than a 12 bolt . I have seen non posi assembly's go for $500 or less. G80 is the posi code . Lyn go on here and look around, good bunch of guys http://www.turbobuick.com/forums/ Kevin Last edited by SSGN; 10-06-2013 at 08:08 AM.

10-07-2013, 09:19 AM	#5
Bobby Zlatkin Member Join Date: Mar 2003 Location: Mills River, NC Posts: 417 Likes: 0 Liked 0 Times in 0 Posts	Re: 8.5 rear end for 1980 G body GM And don't be fooled by the left hand threads on the ring gear. By the time I realized the deal there, I had them suckers so tight they were almost impossible to get loose. Oh well. As they say "live & learn". __________________ Bobby & Norene Zlatkin L/SA

10-08-2013, 12:08 AM	#6
CrateCamaro Member Join Date: Nov 2007 Location: Ontario Canada Posts: 411 Likes: 1 Liked 19 Times in 7 Posts	Re: 8.5 rear end for 1980 G body GM I don't know about you guys but around here 8.5 10 bolts for G body are like hens teeth. I found a mint one in a scrap pile but that was sheer luck. And the fact that it came out of a friends turbo regal to install a 9 inch ford was even better for me. Probably cheaper and way easier to just go with a Strange or Mosier 12 Bolt. Way better tooling, thicker case, thicker tubes. All around better piece. Probably wouldn't matter in a stocker but gear selection for a 12 bolt is better then a 10 Bolt as well. __________________ Tony Valerio 1968 Camaro 1700 IHRA H/CM 1701 NHRA SS/?A

10-09-2013, 10:57 PM	#7
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,135 Likes: 172 Liked 704 Times in 218 Posts	Re: 8.5 rear end for 1980 G body GM Seems to me that QA-1 offers adjustible upper trailing arms that have an offset for the purpose of installing an A body 12 bolt in a later G body car as a bolt-in.I bought stronger trailing arms for my '68 Chevelle wagon from them and got a catalog someplace. Their stuff is pretty nice, as well. While a 12 bolt is getting rather pricey, there is an excellent selection of gears and a small block car probably can't break it. Also I think someone makes an aftermarket bolt in 12 bolt housing now for the A body.

10-10-2013, 10:05 AM	#8
Logus Junior Member Join Date: Jan 2010 Posts: 19 Likes: 0 Liked 0 Times in 0 Posts	Re: 8.5 rear end for 1980 G body GM 12 bolt A body rear in a G body. 2 more Cos. that make the rear arms. Probably easier in the long run, than finding a GN 10 bolt laying around. http://www.maliburacing.com/iceman/ http://umiperformance.com/catalog/in...&cPath=8_60_68

10-14-2013, 09:59 AM	#9
Lyn Smith VIP Member Join Date: Dec 2001 Location: Pontiac,il. Posts: 1,198 Likes: 280 Liked 960 Times in 192 Posts	Re: 8.5 rear end for 1980 G body GM I found a couple places that make the adapter upper control arms for the G body 12 bolt swap.Do the lower control arms bolt up ok?

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