Hey all I've almost finished replacing my th350 with a TKO-500 from classicchevy5speed. The problem I'm having is the transmission is in and when I hit that started it clicks like it is trying to spin the motor but will not spin it. Everything lined up well on the install when putting everything on. So I'm wondering what could be possibly be causing this problem and will I have to pull the transmission back out to fix it because it was a real PITA to get in there. As always thanks for your time and help.