So it just started today, truck shutters in 1,2&3 after I let the clutch out. Almost feels like u joint but disappears at higher speeds. I know my tranny isn't in that great if shape bc it grinds into third but this is new. In 4&5th it's fine even if I slow down and lug it I doesn't shudder. It's probly a tranny problem but not too sure. Ujoints are good maybe driveline out of balance? Trans does kinda click when I let the clutch out after a shift in lower gears. Don't think It had to do with motor but I have been having some other problems with the motor. Maybe motor mount?