for a bit more spirited shifting i add the larger boost valve and billet servo(s) and pwm powervalves. the rebuild's i do i use the superior kit with corvette style servo which give a noticebly firm and very quick shift. the differences in the two kits could have just been updates since some kits will sit on the shelf longer than the other though. normally i use the one's from superior products.
WILL FIT ALL 4L60E SERIES (16 BOLT TRANSMISSION PAN) ALL YEARS These Are New OEM AC Delco Shift Solenoids. the most recent trango kit i purchased i haven't installed yet, been a while since i used one. 4L60E 4L65E 4L70E New Shift Solenoid 2 Piece Kit 1993-on. from tbyrne, if i recall correctly this one should come with the servo. if you do chose that kit, just remember you still are going to want to buy a servo which will basicly not make the kit such a good deal. that kit will work pretty well if you chose the right stuff in it. the other kit should also come with a video to make it easier for someone fairly new to installing one. also for the price you can get the other kit which i believe comes with the servo.