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Author Topic:   GM Rear End
Dirt Newbie

Total posts: 2
posted January 09, 2005 06:22 PM  
I will be running an 84 Regal in an Enduro class that requires GM rear-ends in GM cars. Is the stock rear end worth running? If so, I would find some gears that would fit the tracks that we run as well as putting in hardened axles. I have heard of some guys taking S10 rear-ends and having the brackets welded on them for the trailing arms. Any guidance or past experience would be appreciated.

redneck racing
Dirt Forum Champ
Total posts: 860
posted January 09, 2005 07:25 PM  
I would be thinking that the rear end is a 8.5 and you can get gears almost anywhere for it, I buy mine from Quick Performance. Eddie

[This message has been edited by redneck racing (edited January 09, 2005).]

Dirt Freak

Total posts: 257
posted January 09, 2005 07:47 PM  
The 84 regals came with the 7.5inch ring gear. They arent bullet proof, but I run them in my car (because I have to) and the one in my car has been ran since 2000......still works just fine. There is plenty of stock gear selections for running in low gear. If you wanna run 2nd gear, your going to have to look to the s-10's for the gears you need. The S-10 rear end and the one in your regal are the same thing, just different mounts, so dont wast the time on having mounts welded in.

To get the right RPM's you need, figure out the final drive you need and work with roll out and that stuff

Dirt Freak

Total posts: 344
posted January 10, 2005 07:51 AM  
Look at 82 and up Camaro, R&P work just not the carrier!

Dirt Freak

Total posts: 372
posted January 10, 2005 03:26 PM  
82 and up f car carrier should be the same too. i have bee4n using one for 4 seasons the rs and z 28 have a heavier duty carrier like the monte ss non posi cars have instead of 2 big holes in the carrier there is one big one and one small one, in seven seasons 4 with a metric 8cyl and 3 with a cmaro 4cyl i have only broken 1 carrier and that was this past year at the same time i broke an axle which broke right at the splines.

Dirt Newbie

Total posts: 2
posted January 10, 2005 04:33 PM  
Thanks for the info. I will be running a powerglide in low with a 1.82 ratio. I was planning on looking for a 3.08 gear to get a final drive of 5.6. If I understand correctly, the stock rear end can be fitted with these gears. Do I need a carrier larger than the original 2.73 carrier? I know this was an issue on the mid-seventies Monte Carlo's that I have run in the past.

Dirt Roller

Total posts: 24
posted January 10, 2005 07:13 PM  
Hi I was wondering if you maight have any 273 gears for that style of car could really use some, thanx

Dirt Forum Champ
Total posts: 5390
posted January 10, 2005 08:56 PM  
3.08s are common in v6 auto camaros i think almost every v6 car i have ever gutted had them

Winland Racing
Dirt Maniac

Total posts: 122
posted January 13, 2005 01:52 PM  
I also run enduros with the 7.5"earend. I have bent one housing in about 7 races, no broken axles or gears. The 3.08 will use the same carrier. It changes at 3.23 and higher. I also run a powerglide but with 342 gears, just purchased some 373 gears to raise the r's a bit. My opinion that the 3.08 is not low enough with the powerglide.


Dirt Forum Racer

Total posts: 90
posted January 13, 2005 11:16 PM  
If your rules require you to run a rear end that came factory in that chassis your only choice is a gm 7.5. if you want to look stock and stay strong use side gears from an 8.5 and machine your carrier to accept them, then call moser engineering, they have an axle made for this combo($225 i believe),the combo is very stong and still looks stock to the untrained tech eye!!


Dirt Maniac

Total posts: 141
posted January 14, 2005 06:08 AM  
use side gears? Do you mean spider gears... if so then just run the s-10 carrier it is already 28 spline.

sc1 racing
Dirt Freak

Total posts: 419
posted January 16, 2005 12:16 PM  
hey i have 4 or 5 sets of 2.73 gears for a 8.5. 1 set is less than 5000 street miles. do you want just the ring and pinion or the whole carrier? if you want you can call me at 901-606-4108.

Dirt Full Roller

Total posts: 33
posted January 17, 2005 06:56 PM  
I agree on the 373 gears I run a 1/4 mile and it is perfect for 182 powerglide, if that is the size track your running

Dirt Roller

Total posts: 14
posted January 28, 2005 12:40 PM  
I run a 342 7.5 rear end. 3 races in an enduro car no problems so far but make sure you run a little over full on gear oil. A friend broke an axle on his due to lack of fluid on left bearing.

Dirt Freak

Total posts: 369
posted January 28, 2005 11:42 PM  
i have a nib aluminium cover for a gm 7.5" it helps b/c it has the set bolts that put tension onto the carrier bearings
i can let it go for 120 + shipping
like i said it is new i bought it as an extra when i had to use the 7.5 now i have a ford 9"

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