Trac-lok going?

[ComfortablyNumb]

What are some signs that the trac-loc is going? I am getting this clunking sound coming from the rear of the car when its cold (during cold weather), and when it happens and I give it gas the sound becomes faster and the car jerks more violently. I thought it was engine backfiring at first, but it runs fine after driven a couple of miles, whether WOT or partial throttle. Any ideas?

 

[NO_RICE]

If you only spin one wheel you definately have a bad diff. Some diffs make noise when it is cold, especially right when you start driving because the oil has not circulated and the engagement will be a little noisy.