I'm looking to put in some 3.42:1's in my 89 iroc does anyone know someone (professional is possible) that can do it well for a reasonable price in my area (Los Angeles)??

Let me know thanks !

check the yellow pages under drive line transmissions look for ase certified

check under the SoCal board in the regional boards.
Look at SoCal friendly companies and DynoDon. He is usually pretty busy, but lob him a call or PM.

DynoDon's the man. He's in Anaheim, not too far from the Pond.