try bleeding the system before anything else. there is a bleeder on the pump.

 

what u say ur tuck is doing sounds to me like the "death wobble" is ur truck lifted with big tires?

 

No everything on truck is stock. i guess whatever is going on is something going bad. Whenever it fails i will know then and then repair whats bad. thanks for all the input.

 

i had a truck do that death wobble on me once. i about came out of my pants, i was going around a corner with re-bar on the rack up top and it just did the real fast, and extreme back and forth motion and all i could do was grip with both hands and knees( safe i know!!!!!!). so do u know what causes that so i know what to look for?

 

ive only ever had it happen to me once to a lifted dodge i had and it never did it again, but a few of my friends have that problem, there trucks are lifted, im not sure the exact cause but i think it has alot to do with the alingment and the steering stabilizers being worn out or not having one at all. bad tierod ends also probably play a major role also.