Ok, maybe a stupid question but im pretty sure i dont have a posi rearend. Jack the car up and can only spin 1 wheel by hand, RE code comes to an open diff 3.42 (6 cyl). Every time ive done a rolling burnout i only leave one black mark, but the other day i did my first dead stop burnout and left 2 long black marks from first and i could tell where i shifted to 2nd (5spd T-5) it when to a single black line. So the question stands, can a non posi rear leave 2 black marks, and how? Thanks guys!

You "may" have a gov lock diff. Spinning one wheel it will appear to be an open diff. A gov lock works when one wheel starts to spin, the diff will lock up. Although for street use on wet or snow covered which will work fine, a gov lock diff isn't very strong and it's common to break the locking mechanism.

Pulling the diff cover and having a look inside will determine if it's an open diff or a gov lock.

but wouldnt the gov lock "lock" up when im doing a rolling burnout? Say when im rolling along at 20mph and a spank it in 2nd it will only spin one tire, it will spin it hard, for 100ft, but only one tire.

A Governor Lock will not lock up when the car is moving. The governor has a weight that moves out of position when the car is moving that will not allow it to lock up. It is a safety feature that is built into it.

A standard differential can also spin both wheels if traction is close to equal between the tires.

If the traction is almost equal you can burn both tires. My 4th gen would do that all the time. On a perfectly flat surface i would roast both tires in an open diff all the time.

Does anybody have a picture of a gov-lock?

http://rides.webshots.com/album/55410292AnMJrE

So that is the posi that the camaros came with from the factory? Are they any good?

This is the Governor Lock

The Governor Lock is not a high performance differential. It was designed for trucks in the late '60s and is still being used today, in trucks. It was installed in a few 3rd gen Camaros, but I don't recommend it for high performance use. It has too many small parts in it that will break.

enough throtle dump the clutch and you spin both tires. It happen some times with an open diff. being a V6 car I'm sure thats what you have.If no one has ever been in the diff. It would have a tag on it from GM reminding you to use Limited slip additve

it IS possible to shim an open differential so tight that it will act like a posi. Used to do it to 9" Fords all the time. On flat surface- power brake would spin them both. And off the line both would spin. But in a turn the inside would always spin...

I'd be kinda tough to do to a 10 bolt because of the way it's made. But a 9 bolt with the split carrier it'd be easy.

yes its definetly possible, i use to have a 4cyl s-10 and i fabbed up a GTP supercharger intake n stuff to fit on it, and i could spin it hard enuf to were it would lock and "break posi" as i would say, its possible

Yea i would say it was highly unlikely that anyone went into mine and put a posi in it since it was a v6 car when i got it.

i just put in a 3.42 gear in my posi and like it but so far i have only one tire spining. i read somwhere that if you lift your car up and spin one wheel that if it spins the same way its a posi if other way its open diff. mine is posi and they spin diff ways?

Not a posi. At least not a working one. $0.02