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Author Topic:   rear end
rd427
Dirt Roller

Total posts: 6
posted January 31, 2005 09:05 PM  
just wondering how well gm rear end would wrk on street stock car just looking for options till i get 9inch ford

iowatoolman
Dirt Freak

Total posts: 369
posted February 01, 2005 12:46 AM  
which rear end 7.5 8.5 12bolt???

drive hard or drive home

racer17j
Dirt Forum Champ
Total posts: 5390
posted February 01, 2005 09:51 AM  
I thought the 7.5 axles were thicker all the way down versus the 8.5 that neck down alot ?

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted February 01, 2005 11:16 AM  
Honestly, you would be better off to save your money until you can get a 9" under the car.

Bad gear choices, weak axles, running through the trans.......they're all bad ideas.

Speedway65
Dirt Freak

Total posts: 344
posted February 01, 2005 12:41 PM  
Where we race we can only use the 7.5 or 8.5.Its been like that for 15 yrs,we have good luck with them!But we only turn about 6200 to 6500 from about a 350 hp motor.We also have to run the th350 tranny also.We use 3.73 in 2nd with about a 82-83 roll

racer17j
Dirt Forum Champ
Total posts: 5390
posted February 01, 2005 07:04 PM  
If the track won't let you use a 9", thats one thing. All I'm saying is that if you can use a 9', you'll be better off in the long run to get one.

bobaluuu
Dirt Freak

Total posts: 474
posted February 02, 2005 07:08 PM  
. I ran a 7.5 this year and won several 30 lap races pulling 6600 to 6700 rpms. We had no axle failures. Last year we went thru 2 yukon axles 3 mosers and 3 factorys using the 12 bolt 8.5.Two of the factories simply broke all the rest were helped. My experience is that any axle will be rendered unservicable when struck by a front bumper or the wall. There is very little diff in thickness between the 8.5 and 7.5 in the areas where axles tend to break. We went to light wheels along with the 7.5 and we have lost some wheels due to impact but no axles.

rd427
Dirt Roller

Total posts: 6
posted February 04, 2005 07:51 PM  
thanks for the info been running 10 bolt gm in hobby stock for a while without much problem but wanted some comparison ideas thanks

    

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