[Caddylackn]

A knowledgeable mechanic can fix your existing rear end with new parts and get you what you want. It sounds like the previous mechanic doesn't know how to set pinion pre-load or had the wrong parts. If he doesn't know why its howling, then that is a sure sign he is in over his head.

I'd get a new mechanic that specializes in rear ends. I think this could be done with new performance parts for $1,200 with a reputable shop.

You need a good firm tranny shift kit to bark tires with a mild 350.