Can't Do a Good Burn out....

Not because I don't know how to but because as soon as I get on the brakes after dumping the clutch the tires stop spinning. It's like the rear brakes are locking or overpowering. Is it possible that maybe my proportioning valve is screwed up and sending too much pressure to the rear brakes?

Car's not down on power and the posi is working properly. The rear likes to slide to the drive side, but I don't think that's a problem.

Any ideas?
 
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Rear is fine...03 cobra diff, moser axles, new FRPP 4.10s no noise

It's definitely something to do with the brakes. I really think it's the proportioning valve sending too much pressure to the rear and not enough to the front.

If a proportioning valve is faulty, what will happen?