Originally Posted by 4.0nativepower
Agreed. I am just now going to change my gears out from stock 3.31 with 3.73 i had already bought 3.73 with 8.8 so how that works is truly depends on how much hp and tq you plan on reaching. I am trying to reach close to 500 hp so i am going with a turbo kit and boost no more then 12 psi which is safe to run with stock internals and stock rear 7.5 8.8 do handle alot more power it just depends on how much hp and tq you want to exceed.
I'm assuming you are talking 500hp at the crank and not the rear wheels...if you are talking RWHP then I'd say the 7.5 will be living a short life.
There are guys out there making close to 1000hp and running 8.8 rear ends.
I had a Whipple Charger on my 97 Cobra and tried 12/13psi on the mostly stock DOHC 4.6l and started breaking ring lands although the 8.8 was never an issue...my Maverick had an 9" and the single carb 408 was 650 at the flywheel and 544 lbft or torque...when you hit the transbrake button at 5000rpm you wanted to make sure the rearend was in one piece.
I had a friend with a 500hp motor and 7.5 rearend...he put slicks on the car and turn mid to high 11's...the rearend lasted 3 or 4 weekends before it expired.
I'd also recommend a "C Clip Eliminator" just to be safe even if you do have rear disc brakes.
Also hope the chassis is set up to handle the 200 extra HP.