vibration at 35mph

[LorenBateman]

i have a vibration between 35-50 mph..at 50 and above it goes away..i think it may be drivetrain related because if i left of f the accelerator it goes away..Only under power does the truck vibrate..i checked ujoints and seem ok..but im no expert..1996 xl 4x4..6cyl..bone stock truck

 

[stress301]

Could be the torque converter on the automatic transmission. Not positive. But a good place to start.

 

[LorenBateman]

Thank you for the reply..going to change the ujoints and go from there