this is what activates the rear band for second gear starting.it is under cover on right side towards the rear of trans.yes it can be removed while in the car.you will need to remove drive shaft and trans cross member and then fan shroud [and maybe fan and radiator] so that front of engine can be jacked up to create clearance at the rear.using large prybar to push in coverplate while removing the clip.if you are lucky you can insert new piston and get short bar to go into band. if not you will need to remove pan,valve body and plate to gain access. remember " fortune favors the prepared mind"

david poole dallas tx.