Okay, lets get the application information out of the way first. The vehicle is a 78 chev blazer 1/2 ton 4x4 with a sbc 350, th350 trans. and a np203 tcase. I just completed a motor swap with a new gm crate motor. My problem is this, it seems to run great but last night I went to finally pull it out of the garage to start throwing the lift on and it wont move at all. It seems to me that its the tcase but I'm not sure. Everything worked 6 months ago when I pulled it into the garage but now I got nothin. The tranny shifts through all the gears and it will not roll in Park but it does roll freely in all other gears. The tcase seems real hard to shift to I have to force it back into 4lo and it seems to barely engage. Did I forget to hook something up or is something broken? Any help is appreciated.