BadSS

I'm debating on building the 7.625 rear (Auburn unit and LPW cover).

I've read the tech article (thanks Troy), but I would like to hear from any of you running consistant low 12's / high 11's (or better) with the 7.625 rear. Specifically - what carrier did you put in the rear (Auburn unit, SLP unit, Powertrax etc) and if you would invest in the 7.625 again if you had to do it over?

I appreciate your replies!

AlkyIROC

I originally was using a 3.27 geared 9 bolt (best times below). Last fall I built up 10 bolt and only got a low 12 ET because I blew up the engine first . This season will be the real test with a big block now installed. I'm expecting low 11's. If the 10 bolt doesn't survive then I'm going right to a ford 9". The weakest link in my 10 bolt now is those small gears. I don't expect to break anything else in it except them.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

BadSS

Thanks Stephen,

I noticed on your page you listed "locked differential extensivly modified for drag racing". You mind me asking which unit it is and what you've done to it?

I'm with you I KNOW it's the gears that let go. I had one grenade back in 1987,, but I don't believe the cover with the stud girdle was available then. It appears this may be the ticket to getting them to hold together,,, if there is one.

AlkyIROC

Other than saying the axle tubes are welded, LPW rear cover (stud girdle support) and 28 spline axles I can't give all my secrets away. Lets just say that it's not an aftermarket carrier, the axles are locked together and the only thing that may now break is the tiny ring and pinion. This diff would not be a good choice for a street car.

BadSS

Fair enough Stephen Thanks again. I guess I'll give this 7.625 rear one more try with an Auburn unit ($265) and the stud guirdle cover ($130). Don't plan on doing more than a little street kicking with this one anyway,, very limited slick time. I should get $400 use out of it anyway,,, I hope.