I'm having a problem with ice around here in parking spots. I've had a couple instances where one tire would be on ice, and the other on dry pavement, but when I try to get out, the one on ice just spins and the other sits there. Isn't this part of the reason for a posi rear? When I do burnouts, I can leave two strips, and I just tried earlier to make the the posi wasn't smoked. Also, the car only has 69k miles on it, so I can't see the posi being bad. The only reason I can think of for it doing this on ice, is that there's so little resistance, that the posi is slipping, and letting one wheel spin more then the other, such as when turning. If this is the case though, how come the other wheel does absolutely nothing? Shouldn't it push at least a little bit? Please help.

 

sounds reasonable but i don't know for sure. you might want to change the oil and add a fresh bottle of posi additive, gm's is all i'd use.

 

What you're wanting to have happen, would only occur in a locker-style rear...where no matter what the circimstances, both wheels have drive to them.

Things is, even new....it only takes about 60-70ft/lbs of torque on the opposite wheel to spin it when one side is locked down.

When you're on dry pabement, you have equal resistance on both tires, so both grab...there's just a litte difference in weight distribution that may come into play, but not a lot.

I don't recall what the breakover torque required is from locking the pinion and spinning the tire...probably 150-175ft/lbs...definitely less than what the engine is capable of providing.

Try taking off slowly and evenly and see if power will be applied to the tire that's on the dry side to pull you out of the situation.

Ede recommends new fluid and posi additive, but that won't help you in your situation (although it should be done anyways). The additive is put into the rear to allow the posi to actually slip more, without grabbing as much. You generally know when the additive is breaking down...when you take a sharp turn, you'll feel a chattering in the rear.

BTW, 69K miles on a posi doesn't mean much...could be the car was used in a lot of turning situatons which could accelerate the wear of the cone/clutch setup. 69K on "straightline" driving would leave you with a brand new unit.

 

its not a posi but u coudl check buy jackin up the car and spinning one back wheel and if the other wheel spind the same direction then its a posi but if they spin in oposite directions its not. also if u ever get stuck with one wheel on ise and the other on dry land all u gotta do is give it gas and hold the brake a little bit . like your power breakin and it ill send power to both wheels

 

I know it's a posi. Look at my website, there's 2 long strips. You can't do that with a regular differential.

 

yes u can. my freind does. go do a burn out and just drop the clutch don't touch the brake at all

 

I'm sorry, I really don't believe that. My last car and all of my friends who have/had cars without posi's couldn't spin both tires on a burnout, touching brakes or not.
Either way, I've checked the codes on the car and it has a posi.