8.5 rear end for 1980 G body GM
 

What years 8.5 GM rearend will fit in a 1980 Buick Regal ( G body)?

Re: 8.5 rear end for 1980 G body GM
 

As a bolt in, 78-87. Regal T-Types, Grand National and Olds 442's had them.

Re: 8.5 rear end for 1980 G body GM
 

Don't forget Monte Carlo SS.

Re: 8.5 rear end for 1980 G body GM
 

Finding one at a reasonable price is another matter.

Re: 8.5 rear end for 1980 G body GM
 

Monte SS was 7.5 with 3.73 gear

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.

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

Re: 8.5 rear end for 1980 G body GM
 

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

Re: 8.5 rear end for 1980 G body GM
 

Lots of good G-body info here: http://www.maliburacing.com/faq.html

Great site also. Malibu influenced but tons of G-body info.

been a member under another name there for years.

Re: 8.5 rear end for 1980 G body GM
 

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.

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".

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.

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.

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

Re: 8.5 rear end for 1980 G body GM
 

How much wider is a 70s 12 bolt or 10 bolt A body rearend than the stock G body rearend? thanks for the info guys.

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?