I am having a problem with my 727 that I just rebuilt myself in my 71 short box (the tranny is a 77). It has all new clutches, steels, and bands. The low/reverse band is kevlar lined. I also installed a Transgo TF-3 full manual valve body kit at the same time. My problem is that sometimes, not all the time, it seems to bind up when I shift from low to second. It only seems to do this when I am moving slow, I have not had it do it under hard acceleration. When it does bind up if I am on the gravel in my driveway it will drag the tires to a stop, then it will take off like it is ok. If i give it some gas when it does this, the truck will slow way down, but seems to come out of it. The engine doen not "free wheel" when it does this, it stays under load. Any ideas????? Also should this valvebody need the kickdown hooked up????? Other than this the tranny seems to work great and has a very firm shift. Thank you in advance for any input.....