I have a slightly different trans than yours but the same symptoms. Its a 46rh I rebuilt in a 93D250. I've been told I could have a mushroomed valve in the valve body. I jacked up the back of the truck and ran it through the gears with pressure tester on all the different ports. It has double the line pressure of stock which is what I would expect given the fact I have the transgo kit in it.
Probably going to have to drop the trans pan and check the valve body again. Ugh.
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