A friend has a 727 w/ a Turbo action transbrake valve body in it. When he stages the car and sets the transbrake, the car rolls forward slightly before it "sets". It releases and shifts fine, just won't set still. What causes this? Clutches slipping, loose band, too much end play, ect? All of the above? He hooked the line lock into delay box to release the same time as the transbrake and that seemed to be better, but I see that as a band aid. If the transmission (and valve body) is working correctly, he shouldn't need the line lock.
Thanks,
Brian