My main question is: Is it possible for a posi unit to wear out, and treat the axle like an open diff?

I am starting to suspect that this may be happening.

It all started back at Atco about 3 months ago, when I was getting no traction off the line (but I used to get good traction on the street), and I found out from a friend that only ONE tire was spinning while doing my burnout.

Well, I got home and did a few quick burnouts on my street and left two marks, but from time to time (like today), there will only be one single rubber mark. Now, I did try to kick this one out sideways, but I Started off straight, but there is no sign that the other wheel was spinning.

Now, it came to my attention from a friend that I have a small leak thanks to a bad axle seal on my left axle. Very slow. When I did my gear oil swap, I still found that there was a good deal of oil left in that carrier so it's an extremely slow leak. I was holding off on a fix until I got back home for the summer from college, but would something like that compromise the functioning of my rear? (yes, I did put in Posi additive)

I'm still unsure of the workings of a posi, so I don't know if this behavior is normal, but I'd rather not have to invest in a new rear if this isn't normal

Any help is appreciated guys, thank you =)

 

Yes.

Sounds like your posi has croked. How many miles are on it? The only time a posi does not function is around a corner.

 

There was an engine swap, and supposedly the odometer is off (so says the previous owner) but it reads over 300k

However, I roasted them again today, even got a bit sideways, to get a burnout picture and there were two nice even black bold lines...wtf? It's like it's working selectively or something?

 

Might be on its way out. Otherwise I have no idea.

 

just because you can fry both tires doesnt mean your Posi is working. back before I had a posi i could always fry both tires if i was on level ground, I could even slide around courners in both directions if i hit it just right. I swapped in a zexel torsen diff from an LS1 car for the very reason you started this post. my posi will never wear out like a clutch type one will.