Well I cooked the trans last night. Went sled pulling and left the line in 3rd gear. Truck was running good but I pedaled it a bit to try and get it to hook up (first 20ft) then laid back into it. Locked the converter and everything felt good. All of a sudden the truck tried to grab fourth at the ~75ft range. I believe I had the wrong trans tune in it which allowed it to grab fourth if not placed in 3rd (my typical trans file doesn't care if its in drive, it limits to 3rd only), at DPC I used this same file and it didn't try to grab fourth.
Currently, the truck will move forward ONLY in a 3rd gear start file. If I put a normal trans tune back in the truck it won't move at all. It acts like it has a trans brake and immediately is up against the converter. It has no reverse, it tried to move forward in neutral after the hook when I got it into the pits. You cannot push the truck easily by hand with the truck in neutral and running.
I'm wondering if when it tried to grab 4th that it may have cooked the C1 since 3rd gear is C1/C3 and 4th is C1/C2. I don't believe the trans releases C1 during the 3->4 shift, is that correct? For the rebuild, I am going to end up buying one of Evan's DIY kits and completely going through the trans to make sure it is ready to go for next season. I am just glad this failure didn't occur at DPC! Side note, can a Mike L/Evan C3 oiler be used with a trans that has Goerend C3 lube PTO covers installed/case drilled for them?