I've got problems, went to drive the truck just now after finishing up all the bumper/sliders/body work and i've only got 1st gear and neutral, can't get anything else. Not throwing any CEL codes and the battery was discoed when I was welding on the truck. Shifter moves through the gates just fine and the proper lights light up on the dash for the selected gear but anything 1st-5th yields 1st gear and 1st gear only and anything neutral through park yields neutral only. Any ideas? I would check the fluid but don't know how as it is a sealed unit. I am clueless what the problem is seems to be an electrical thing as the transmission doesn't seem to be slipping as if the clutches were dying/low on fluid just the ECU isn't letting the other gears engage.