tranny

i got a 1968 chevy with a turbo 350 and it wot move when i put it through all the gears. i checked the fluid and the color and smell and its fine. idont know if the filter need changed or the tourque converter needs changed. it ran fine all last year but maby the cold did something. the modulator valve could be the problem but nihad aproblem with another car where the hose came off and it would only stay in first gear. this truck is different because when you put it into gear it wont even budge or jerk in any gear.

It's not the modulator valve. That only helps with the 1-2 shift. Won't budge in any gear would point me right to the pump. If you can get your hands on a pressure gauge, put it in the line pressure tap and see what psi the pump is putting out. Also check the throttle valve cable--but I doubt that's the problem