Im replacing my trans with a nice firm sifting one and want the best performance mount(if thats thinkable) I can get I was thinking polyurethane from enery suspension but are they really any stiffer then a stock rubber style? Also can someone PLEASE tell me which on I need because I CANNOT figure it out the truck is a 84 1/2ton 4x4 with 700R4 and 208 /forums/images/graemlins/thinking.gif