SLP IROC-Z

iTrader: (14)

First off just want to say i know the 7.5 is not a great axle. Im considering doing 4.10s, a girdle, axles and having the tubes welded to the housing to get me by until i buy a fab 9. It has a factory torsen diff. Question is will it take low 11/high 10 second passes in a 3500lb automatic 4th gen with a 4500 stall for a while? I know a 6 speed will kill one in short order i dont have any personal experience with one behind an auto so im curious what kind of longevity others have had.

LS1 TJ

A bit will depend on how sticky the rear tires are and how you leave the starting line.

91 Z28

iTrader: (3)

Definitely gonna be living on borrowed time. That 4500 converter might make its life that much shorter. How long were you planning on using it before buying a 9" rear end?? Personally I wouldn't even bother screwing around with a 10 bolt that's money that could be spent on a better 9" unit

wannafbody

iTrader: (2)

I've seen the teeth sheared off a 10 bolt 4.10 pinion. It's small. 3.73 would be slightly stronger.

dannyz

I ran for years on a 7.5 with just a girdle with 3.73 richmond gears.
Mod's in my sig.
I think what really helped a lot was my running Hoosier QTP's which were a bias ply tire with soft sidewalls.
I would launch off the footbrake at 2500-2700 rpm's on nitrous
They wrinkled upon launch and really took a lot of shock off of the drivetrain.
My pinion eventually broke a tooth, but i was still able to drive 40 miles home.
After that i spent some money and bought a strange engineering 12 bolt,