Truck almost stalling during takeoff

ah i dig, is there any play in the drivershafts going into ur axles? what about the carrier bearing?

 

im not sure if this would interfere with pulling forward but what about ur motor mounts

 

wow i dunno, what engine u got?

 

any rpm changes while letting out the clutch

 

Mine does the exact same thing , and it also has a nice quirk when it gets cold over night , first thing in the morning it wont shift into 8th gear, it will get to 8th then glitch and hit neutral , let off the pedal, and it goes back to 7th , try again. Usually takea 3 attempts and its good for the rest of the day. Only does it when its cold outside and the truck has cooled off. Boggles my mind

 

Has anyone looked to see how the engine is actually programmed? It may have a de-rated fleet spec that is keeping the torque down in the lower gears.