I went to the track the other night and my friend was watching my burnout. He said that one tire started spinning before the other. I use a line lock to hold the front brakes while I spin the slicks. This posi isn't very old. Is this normal? Is it doing this on my launch also? If it is then that means my car isn't hooking like it could. I have an adjustable torque arm, lower control arms, relocation brackets, and sfc's. My best 60' time is 1.792 and most are 1.8's. I have over 500 hp w/n20. Also my best 1/4 mile time is 12.36 at 110 with a 1.8 60'time.

Do I need a new posi?

 

most likely the suspension isn't loading the same on both sides. try an air bag to preload the left side

 

The air bag needs to go in the right side, right?