[O2Bsogood]

I just put my rebuilt th350 and new stall in last night. I put 10 quarts in it and it's just now barely showing on the dipstick, I'll get a few more quarts when I run to town later. To fill the converter and the trans both, I think I'm going to need somewhere between 2-4 more quarts, so somewhere between 12-14 quarts. But yeah like everyone else said, being too low on fluid will not let it shift. With the rear wheels off the ground, start the truck, put it in neutral and add fluid until the level is between add and full. Then go thru all the gears, make sure you stop the back wheels before shifting back into or out of reverse, then put it back in neutral and check it again.