hey everybody so i just got done putting in a new auto trans for my sc400 and ive got a few questions. so when i had first connected everything and started it up to test the transmission, everything was fine and it would shift into gear and spin the wheels fine, but then after getting underneath to adjust the shifter linkage, i havent got it to work again since! ive tried fiddling with the linkage for hours and am now nearly certain that isnt the problem. when i shift it into park and go under to spin the driveshaft its locked, and in neutral it will spin freely. the only issue its seeming to have is that once i start the motor, the trans it wont spin the driveshaft on its own. based on all of this i would assume the transmission just needs a bit more fluid, but i would love to hear yalls thoughts on what the problem could be! thank you guys in advance ! ~ edit: it was the fluid levels