Very interesting read guys;
Some very good points were brought up, orifice cup plug in tf-2 kit is to delay 3rd apply; Yes; for correction of overlap on 2-3 shift Firmness of 1-2 shift is controlled by line pressure and band arm apply ratio; Yes; throttle pressure and line rise are criticle to shift feel so it is very important to set it correctly. As to the question of do you need to install the cup plug ; No; If you are able to set the intermediate band properly to obtain a near neutral 2-3 shift feel. All books and kits give you a set band adjustment for the int. band and tell you to follow all directions in kit because they know that this is a middle line and will result in a good shift feel under most ratio and pressure settings resulting in less complaints to manufacturer.
One if not the most criticle adjustment to torqueflights is the Int. band , to tight or to loose and you get bindup or flair on the 2-3 shift.
Adjust pressure regulator spring for shift feel, and band for shift quality, Throttle rod for shift timing and kickdown scheduling.
Happy tuning:
Lon Kopaska ( ATRA and AAMCO master certified rebuilder)
