Camaro's rear end puzzles me. I've had both back wheels off the ground before and did the spin test on it, it seemed to be an open rear end, but while I was doing the spin test I could jerk the wheel while it was moving and it would clunk and both wheels would spin the same way then.

That was last summer, I havn't really drove that car much since I've had it. Today I was backing up through the yard when I got to a bumpy place. It started to spin one wheel. Well I let off and tried again, it still spun, but then I pushed down on the gas just a little more and I heard a clunk and both wheels started spinning.

So what's the deal with that car? Is the rear end broke?

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1989 Pontiac Firebird Formula LO3 Auto
-180 degree stat
-Hooker Cat-Back
-velcro t-top bag
-Wonder Bar from my IROC
IAT MOD, 3.3ohm resistor

*****Possible future mods*****
4th gen seats, fiberglass spoiler, new paint

1985 IROC-Z, TPI Auto
-Accel Super Coil
engine and tranny overhauls coming this summer


http://www.geocities.com/krt80/

 

Sounds like a posi that is on its way out...

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

 

What you have there is an Eaton Locker rear end. The clutches engage when there is about a 100 rpm difference between the 2 rear wheels. Before that, it acts just like an open rear. When it's up on jack stands, start turning one rear wheel faster and faster and at some point you will see. The trouble with those is that when they wear out, they engage suddenly, possiblly kicking out the rear end, or breaking something. I broke mine at the drags. Don't know what happened first, but a whole mess of stuff broke, including the spider gears and the carrier. That's why I now have a Torsen.

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1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Torsen, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax

 

I agree. It's a factory locker. Although it will lock up when one tire starts to spin, the locks are not very strong. They're designed to give better traction in mud and snow but are not very strong for drag racing. A posi or torsen diff is a better shoice.

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

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546

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 know the rear axle isn't factory. The RPO's on my car say it came with rear disk, but sometime before I got it the car got a rear drum axle on it.

I was thinking it could be a locker. When I checked the rear end grease it looked brand new. Is there any way to tell what I have for sure without taking the cover off? I'm pretty sure it's a locker though.