Thread: how safe is top swap

Mines been SSm90'ed for 5 years with not one issue. Other then the STOCK gt trans is just now slipping.

Originally Posted by SDgrandprixGT

what supporting mods

When I first got the ssm90 I ran a 4.0 pulley with a plog and 3 inch downpipe. Ran that set up down to a 3.8 pulley for a year. Then got headers and went to a 3.6 and 3.5 pulley. Im now on a 3.25 pulley . below is how the car sits now


http://www.grandprixforums.net/green...-gt-42587.html