when i am going down the road and i stop at a stop light i feel a bump below me. kind of like a torque bump ifyou know what i am talking about.. once in a while i feel it taking off from the light but mainly when i stop.. it happens as the truck stops and "sits" from the foward movement.. hope that made sense

 

Grease the slip yolk on your rear drive shaft.

 

i normally keep them greased at every oil change (5k miles).. i may have accidently over looked it... speak of when you are greasing the shaft not the ujoints do you pump it in till you see the shaft move? or just a few pumps are good?? thanks guys