01 excursion. 4r100, fresh rebuild, supposed to be a stage 5 with a monster torque converter. I put the tranny in, hooked everything up, it’s full of fluid, shifts fine in every gear but won’t shift into O/D. It will redline in 3rd but won’t shift out. Reverse will kinda shudder a little sometimes too, idk if that has anything to do with it. No programmer, all stock. O/D light flashing so hooked up a scanner, i don’t remember what the codes were exactly but it’s getting the command to shift into every gear, solenoids are on and off when they’re supposed to be. I’m just at a complete loss and I’d like some insight before I probably have to tear into it. Thanks guys!

solenoids were bad or something like that and mechanical problem is what the code numbers were

I’m glad this account is free cause I don’t think I could have figured that out on my own