hey guys, just put my new(rebuilt) transmission in this weeekend, fired up the car last night, got the fluid to the correct level, then started going through the gears, the cars is on jackstands so possibly it is screwing with me and it wont do this when its on the ground, but if im going and rev it up to about 1800 RPMS it starts to shudder off and on kinda, not horrible but it dosent seem normal, ive heard of torque conveter shudder before, but any ideas of what this could be? should i run it for a while to see if it goes away when the tranny breaks in? its under warrantee for a year, but i just dont wanna take it out again!!!!, blah, well any help is appreciated!, thanks guys