That 1-2 shift hole is tiny. Drill it out to at least 1/8". I go 3/16" on every one I do, but I think just removing the ball will do the same thing...maybe somebody has experience comparing that difference.
I know it's tough to describe on here but which hole is that exactly? I'm debating just buying a TransGo TF-2 and going all the way with a full shift kit but if I can make things work better with what I have then that's OK. I liked how the trans shifted before, aside from the part-throttle shifts being way too early like any stock Torqueflite (yes even with the KD linkage adjusted properly).
I searched online and found a set of instructions for a TCI shift kit (can't find any for the TransGo kits) and from what I've read I don't think this valve body has many modifications. The only things I've noticed so far are the lack of a check ball in the transfer plate at the top location (going off my last pic) compared to the stock late-70s VB and there is no pressure relief spring or check ball in the lower-left corner of the upper casting; I'm wondering if that may have contributed to the cracking?
I still have to pull the springs and valves from the upper casting though, I know SOMEthing has to be different with this VB because the car shifted at 5500 RPM at WOT in Drive which a stock 904 doesn't do in my experience. The shifts also felt firmer than stock but only slightly.
