550-600HP 4spd suspension help

if you want to run a stick at high torque you should look into a jerico

the guys on moparts swear by them lol

the stock 4speed... ok if you have lots of spares. i had a 340 dart with about 400hp that would eat them about once every 6 months.

p.s. as far as rear axles and stuff Cass is the man.
known as "doctor diff"
doctordiff.com

he's located in polson, montana might even be close to you
he helps people all over the country