This is my first post, I've found myself in a predicament of trying to finish a truck project in time to move 4 hours away next week. Prior to building and replacing the engine, the transmission worked fine (5 months ago). But being as it is a performance build and the factory efi wouldn't support the power, I installed an aftermarket EFI system with an MSD Atomic TCM to control the transmission. While it sat without the hood, the dipstick was a little open and I know some water had to of gotten in it but I have replaced the fluid and the level is correct. I should also note that I installed a new hughes billet torque converter. After the initial set up of the tcm, I shifted the transmission into gear and nothing. I can rev it to 5000 and nothing happens. It will roll in neutral. I haven't checked line pressure yet. One note is that I haven't been able to calibrate the TPS on the TCM and it doesn't read my RPMs like it should, but I feel like it should still move in reverse and first gear at least..