[dannyd0ne]

hello my name is dan this is the first time ive been on here (a new member) and yes ive just rebuilt a 327 engine and added a 700r4 stock tranny and put them into a 85 210 truck well right now im in the breakin stage on the motor,but ive noticed the transmission fells like its slipping the faster i go is it because i need to hook up the lockout for forth gear or is the motor to much for the tranny? or is the tranny just need to be rebuilt? thanks dan