only reason tranny is a concern right now is because the eng is already in progress so would like to start getting the trans ready would liketo have everything going at once instead of one thing at a time . as for the things seen before i have been there i already do have the final drive mod . i have been looking at the sites i found the shift kit for like $18 but im looking for a valve body and a tq con but i cant locate them maybe im just using the wrong types of searches i don't know. also looking at level tens website but can't seem to find the stuff for a604 only a n manual