I have a ford f250 SD 4x4. When I accelerate I get a vibration under the truck but as I reach the higher gears it stops...any idea's on what causes this?

Vibrations can be cause by worn out u-joints out of balance tires or even a bad cooling fan clutch can cause drive line vibration. The 4x4 you have to turn the locking hubs on the front wheels from FREE to LOCK then you have to move the shifter from 2H to 4H. Thats about it.

mine does the same thing. I know its not the u joints... I will keep you updated ...I'm going to try changing plugs and fuel filter , maybe coils...I'm not getting a light on neither, or this would be simple to chase down. I've been following another post, check you IAC....has to do with air to fuel mixture. Hope that helps.

Mine also did the same thing. It has gotten worse over time and now it has a serious shake at 50 and even worse above 63 mph. The dealer is replacing the Drive shaft because it is bent. Only 47,000 miles on this truck.

Mine did the same thing from a stop when I accelerated but not in the higher gears. I added positrack fluid to the differential and the vibration stopped. I read that the fluids separate in the large tanks at the Ford factory so some get to much positrack fluid and some don’t get enough. The positrack additive comes in a squeeze tube at the auto parts store.