Cuz I notice when I gas it hard from a stop and at the same time turning the tire will seem to go bumpa-bumpa-bump and slip befor it grips. Also when I had the rear end jacked when I turn the left wheel the right one rotated in the same direction and speed. Is this posi? If it is posi is it normal behavior for posi? I have always owed limited slip Chevies before so I know littel of "posi".

NO! it is a sure grip
That is even better than a posi, as you don´t have to drag that chevy around...

Could be a suregrip and it could be screwed up spider gears. Which do you want? Which is more likely? I like the term " gas it hard"... sounds like cheap porn...or beans and beer.

_________________
Yeah....Im the one who destroyed this rare, vintage automobile.....

how you you tell its a suregrip? is one thing that both tires should spin.?well if thats the case i know i dont.

one tire that looks like a slick no tried but on the sides. a friend was behind me at a stop light and i just had to smokem. was funny now when i drive by that light you see the burt marks and even tore up some of the street

A working sure-grip should leave TWO black marks, an open rear end leaves one

If you jack it up and rotate one wheel (trans in NEUTRAL) and the other wheel rotates the same way, then its probably an SG... but if it only leaves one black mark its worn-out.

If you jack it up (trans in neutral) and you turn one wheel forward and the other spins backward or doesn't turn at all, its an open rear end.

_________________

I've smoked down both skins in an open rear car with a big-block many times. The thing is, the right one starts spinning faster after a short distance, and the left slows down to vehicle forward speed. So, the right rear will inevitably out-peel the left.

D/W

_________________

If it ain't broke, fix it!