76custompaint

Horsepower that is, running 11 inch tires in the rear (not slicks), will the frame twist if there is too much torque or will the tires just spin? Thanks in advance

Love My 72 and 77

568.5978697 HP no more!!!

LOTAHP

...I heard you can get up to 568.5978698 HP

Glensgages

It'll depend-upon exactly WHICH street-tires you are running (rock-hard or sticky-Mickies):
I doubt the 'frame will twist' without true slicks.

Besides, I'm guessing you'd bust the rear-end long-before you suffer frame-damage.

Van Steel

Unless your running flares, 11" wheels will not fit under the car. They will stick out. How much HP do you want to put to it?

76custompaint

600-650hp

Gordonm

You had better strengthen the rear and half shafts before worrying about the frame. The stock IRS will hold about 500 HP on street tires and that is no guarentee. Slicks and things will break. 600 to 650 you had better get some HD parts back there.

76custompaint

Yes, I have a new differential that is said to be able to go up to about 750 horse.

GTR1999

What was done to the rear end to "beef it up"?
Gary

76custompaint

New gears, ring and pinion, positraction carrier, carbon fiber clutch pack, stub shafts, seals, everything on the inside is new basically, 3.55 ratio. Not worried about the differential or driveline. Just wondering if the frame can handle it if it has a 650 hp engine and is running 11" summer tires that aren't very sticky?

norvalwilhelm

I run more then 650 horse through mine and when I was running slicks the transmissions kept breaking before anything else. I never worried about the frame.

GTR1999

I wouldn't expect those carbon fiber clutches to last long under 700 hp launches. For 400hp and under street driving they may be ok but for what you're thinking of , dunno. I talked to Kenny at Tom's about them a month ago and he told me they used them in a 700hp drag car and they lasted one pass. If you bought a new Eaton loaded carrier and are expecting it to hold up under those conditions you may be in for a surprise, I hope not. I built a carrier for a friend here a few weeeks ago and didn't use the gears or clutches. I'm not trying to jinx you by any means, but I would have built it differently. Go to Tom's site or check out last month's Hot Rod for more info on the HD rear ends.

The frame could use some gussets in places.

Good luck,
Gary

Van Steel

Here's what you need.
http://www.vansteel.com/index.cfm?fu...&SubGroup=1878

GTR1999

- What he said Of course that still doesn't address the differential parts. For that I would use heat treated 10-17 spiders, polish and tune the carrier and clutches, use solid steel clutches, use steel bearing cap with 1/2-13 socket cap screws on the left and 7/16-14 cap screws on the right. Use solid pinion sleeve,Tom's 355's, HD yokes and HD cover. The next step up would be a 12 bolt conversion.
Gary