Dam, we're really going to need some sort of grammar requirements pretty soon. You guys can't be that lazy to type like this and if you really can't spell or speak properly you should be doing homework, not playing on the web. :-?

my brain hurts...

care to explain?

posi = limited slip, it is a simple tension system. when you make a turn the limited slip will allow one tire to turn faster to make the outside of the arc while leaving the inside tire turning slower. when going in a straight line, since the pressure on both tires is equal, it will try to turn both at the same rate.
for both to be locked up at all times is a spool as smokinss stated

ummm okay

they are right you know


1. open diff.....one wheel spins

2. posi.......rate of spin changes on inside wheel to assist traction and turning in street vehicles.

3. spool.....both spin at the same rate all the time, great for drag racing, not as good for street use for the same reasons that posi is good

its only something you can experience...

brandon im right there with you...

and wow i can see this going all sorts of bad places.

Actually, limited slip is more street friendly then a posi. I haven't inspected the posi in my 70 SS396, but there is no limited slip to it and it hops when making some turns and pulling in and out of parking spots. My posi might be "modified" so that it's jammed together to act like a spool, but I won't know until I check it out.

Eaton posi?

The clutch pack springs might be too strong. I think the green ones are strongest, followed by yellow and one other...

thats it .. i read enough!

come to millville and see for yourself :lol:

thanks for backing me up dan :lol: millville is teh sux0r

corrosion can also cause it to be too tight. jeff, did th ecar sit fo ra while before you bought it?

Yeah, the previous owner didn't put many miles on it at all. I'll open it up this winter to see what's going on. I can't complain though, it keeps the car pretty dam straight even as your spinning the tires going through the gears.

only problem with corrosion is you have to be careful with solvents. a lot of stuff will either bake to the friction material and glaze it or cause the material to dry out and wear faster.
WD-40 is pretty gentle and should provide a solution.

Definetly worth a shot, but if that's the case it's time for a posi rebuild. :D

okay so let me get this right..spool is stright posi and limited posie is were the tires intercound with each other right..

No.

Limited slip is the generic term. Different companies have/had different names for their limited slip units:

Chevy- Posi-Traction
Ford - Traction-Lok
Pontiac - Safe-T-Trak
Mopar- Sure-Grip

Etc...

They are ALL limited slip differentials. The rear wheels can spin at different rates to allow smooth cornering.

"POSI" is a slang term for limited slip, like Jell-o is for gelatin or Coke is for cola.


A SPOOL is NOT a differential in that it does not allow the wheels to spin at different speeds. Both tires spin at the same speed, period. You will drag the outside tire in a turn.

okay then..i got it...sorry for the mastake