does any one know how much horsepower an 84 H.0. rear end can handle?

 

There's nothing special about a HO rear end. It's the same as every other third gen rear end. If it's a 9 bolt instead of a 10 bolt then it can take a little more abuse. I was putting close to 500 HP through my 9 bolt with no problems.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress 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
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

 

i broke mine with the stock 5.0 ho

 

I broke two with the stock L69.

 

i was gonna think about taking my parts car 84 ho and put its rearend in my berlinetta.......NEVERMIND NOW!!!!

 

Well, you could definately find a buyer for it, then. I was searching for your 1984 HO's axle (3.73/open/drum), but found a 1984 TA's axle (3.73/posi/disc) instead, and bought it on the spot.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

I'll bet you guys who broke your rears had 5 speeds (or at least a manual tranny of some kind). Either that, or you were reving the engine up in neutral and slamming it into gear, and busted trannys along with the rears.

Check out the ultimate 10 bolt build up article. It's got good stuff in it. If you've got an auto tranny, you need to be putting over 400 equines to the wheels to threaten a properly built and setup 10 bolt (which you can do for a lot less green than what a 9 bolt or specialty 9" or 12 bolt would cost you).

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

This is true five7. There are some high 10/low 11 sec cars w/ 7.5's - properly prepped. I have a 12sec 82 Z28 with Richmond 4.10's and an Auburn mini-spool that has over 250 passes on it. I've always said I'd replace it w/ a better rear when it broke, but It hasn't died yet.

 

That makes me feel better but I hope my race prepped 10 bolt can hold up to the big block torque.

I'm in the same frame of mind. If the diff lasts, I'll keep it. If it breaks, I go with a 9".

------------------
Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress 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

 

Yep, my car is a five speed. I wasn't too hard on it but I never babied it either.

IMHO, why mess with it. After buying all of the parts and paying someone to "do it right" Every time you launch, a little voice in the back of your head says "I wonder when that 7.5" gear is going to grenade?" "How about those spindly little axles?" "Will my car still drive straight on 3 wheels when one of those C clips lets go?"

Sorry, not me, went though it twice. Maybe it wasn't done right. Who cares. Now I have a Ford 9" built by Moser. Yes, it cost a small fortune. Probably about the same as setting up two 7.5's. On the upside, whether I run slicks, spray or a big block, I will never hear that little voice again.



[This message has been edited by Zee (edited December 17, 2000).]

 

how did you mange to break the rearend with the stock driveline?? the 3.73s are the only part of my car not showing signs of wear,after counless abusive "stunts" (I got in when I was 17)the marks are still embedded in the pavment all over the northshore area in MA.

 

I believe it was deflection in the carrier or the case. Either way the first rear broke a spider gear and wore the heck out of the ring gear. The second broke 3 teeth off of the ring gear. In both rears enough metal was thrown around that the ring and pinion, carrier and bearings needed to be replaced.

Lets face it, there are plenty of posts on this board from people who have broken one of these rear ends with minimal if any mods. This is a notoriously weak spot on our cars. You guys that are making them work, all the power to ya'. But, chances are, its just a matter of time.