[IROC383]

Hey guys,
Im in the process of tackling the rear end for a future AI camaro. I've seen different set ups for different applications.
I currently have 85 Iroc with 7 5/8 stock 3.73, with Power Traxx posi. I carry ZR1 11" on back with spacers. Id like to beef up rear, add disc brakes and set up proportioning valve. Which option would be best for least money. Chattanooga, TN.

[nape]

Ford 9". Any stock rearend, even freshened, is on borrowed time at AI power levels in my opinion.

[StanIROCZ]

Any stock rearend, even freshened, is on borrowed time at AI power levels in my opinion.

I disagree. You bought 2nd hand rear ends that probably had garbage set-ups with aftermarket gears, and didn't you have a clutch issue at the time?

Randy M. was putting 500 HP through a 10 bolt with a 3.91, I think a GM 3.42 / 3.73 with a good set up can last a long time with <350 HP. Maybe not forever, but a long time.

[nape]

I disagree. You bought 2nd hand rear ends that probably had garbage set-ups with aftermarket gears, and didn't you have a clutch issue at the time?

Randy M. was putting 500 HP through a 10 bolt with a 3.91, I think a GM 3.42 / 3.73 with a good set up can last a long time with <350 HP. Maybe not forever, but a long time.

Most of them were stock 3.42 rear ends, one was a 3.73 but that one had the pinion nut back off. The clutch issue was just a Quartermaster clutch, they're harder on driveline parts on take off and until you get used to them, more likely to wheel hop on downshifts.

We had a CMCer break a 9-bolt earlier in the year. Power levels are not the biggest contributor to gear breakage, IMO. Wheel hop under braking is the biggest issue, followed by rough treatment over curbs, and shock loads from breaking the tires loose and hooking up. Wheel hop will break shit, I broke the pinion support out of 9" center earlier this year from standing starts running a setup with negative antisquat.

The other thing to think about is amount of use. A 10-bolt will last a lot longer time wise if you only run 2-3 events each year and call it a season. Running a 7-8 event race season puts a lot more abuse on it then track days.