question, G body 7.5 rear life

Dragsinger · 09-25-2020, 03:39 PM

In a G body stocker weighing about 3200 with a 305 stocker package, running low 12's high 11's

Will the 7.5 gear give any service life?

Bob Gullett · 09-25-2020, 05:50 PM

50ft or 50 seconds which ever comes first! Spend the money once and put in a 12 bolt. Several manufactures offer a complete bolt in.

Brian Fink · 09-25-2020, 05:54 PM

If you are making decent horsepower and the suspension is up to the job,the 7.5 won't hold up. I thought a Grand National 8.5 would do the trick ;that piece failed after a few seasons .The answer is to do it right the first time with a 12 bolt and pro gears.

Jeff Stout · 09-25-2020, 08:12 PM

Yes to all above. Had a Firebird. It ran 13.60 and boom oatmeal in the rear end housing

CMcAllister · 09-25-2020, 08:15 PM

Axles and internal parts are all about the same money, save for the extra cost of pro gears. Put the best unit in it that you can from the beginning.

Ralph A Powell · 09-25-2020, 08:49 PM

Oldsmobile had a bolt in 12 for the G-boy racers. There are a few around if you know where to look.

Mark Yacavone · 09-25-2020, 10:06 PM

Quote:

Originally Posted by Ralph A Powell

Oldsmobile had a bolt in 12 for the G-boy racers. There are a few around if you know where to look.

I give up ... Where do you look?

Jeff Stout · 09-25-2020, 10:28 PM

Quote:

Originally Posted by Ralph A Powell

Oldsmobile had a bolt in 12 for the G-boy racers. There are a few around if you know where to look.

News to me. Any more details?

SSDiv6 · 09-25-2020, 11:56 PM

Quote:

Originally Posted by Ralph A Powell

Oldsmobile had a bolt in 12 for the G-boy racers. There are a few around if you know where to look.

None of the factory issued Oldsmobile Stock Eliminator cars had 12-Bolts in the cars. They all had 8.5 rear ends. Later on, a few switched to aftermarket 12-Bolt rear ends.

SSDiv6 · 09-25-2020, 11:58 PM

Quote:

Originally Posted by Dragsinger

In a G body stocker weighing about 3200 with a 305 stocker package, running low 12's high 11's

Will the 7.5 gear give any service life?

Find a 8.5 from a Grand National or 1984 to 1987 Olds 442 or an aftermarket 12-Bolt.

09-25-2020, 03:39 PM	#1
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	question, G body 7.5 rear life In a G body stocker weighing about 3200 with a 305 stocker package, running low 12's high 11's Will the 7.5 gear give any service life? __________________ Larry Woodfin 471W

09-25-2020, 05:50 PM	#2
Bob Gullett VIP Member Join Date: Mar 2002 Posts: 1,099 Likes: 56 Liked 461 Times in 111 Posts	Re: question, G body 7.5 rear life 50ft or 50 seconds which ever comes first! Spend the money once and put in a 12 bolt. Several manufactures offer a complete bolt in. __________________ 68 Chevy11 327 F/S

09-25-2020, 05:54 PM	#3
Brian Fink Member Join Date: Jul 2007 Posts: 173 Likes: 39 Liked 28 Times in 9 Posts	Re: question, G body 7.5 rear life If you are making decent horsepower and the suspension is up to the job,the 7.5 won't hold up. I thought a Grand National 8.5 would do the trick ;that piece failed after a few seasons .The answer is to do it right the first time with a 12 bolt and pro gears.

09-25-2020, 08:12 PM	#4
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,481 Likes: 63 Liked 701 Times in 279 Posts	Re: question, G body 7.5 rear life Yes to all above. Had a Firebird. It ran 13.60 and boom oatmeal in the rear end housing

09-25-2020, 08:15 PM	#5
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 599 Likes: 15 Liked 886 Times in 246 Posts	Re: question, G body 7.5 rear life Axles and internal parts are all about the same money, save for the extra cost of pro gears. Put the best unit in it that you can from the beginning.

09-25-2020, 08:49 PM	#6
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 385 Likes: 2 Liked 225 Times in 136 Posts	Re: question, G body 7.5 rear life Oldsmobile had a bolt in 12 for the G-boy racers. There are a few around if you know where to look.