Hello all. I am having an issue with an AX-15 and hope I can get some answers here. When out of the truck, I could turn the input shaft by hand in any gear and not be able to hold the output shaft from spinning. Once I installed the trans in the truck, I started it and ran it in every gear without any issues. Once I put the driveshaft in, the trans does not spin the driveshaft in any gear, and it makes a growling noise. Any idea what could be causing my issue? Thank you in advance for any wisdom you may be able to share.