I have a 1980 k100 love it the best truck I ever drove. having a problem with the cab lift system. The right side goes up much faster then the left so much so that the body twists to the point I`m afraid the mounts will break. pistons are only one year old, pump is new, lines are good. thought I had a bad piston so I took them out switched them to see if the problem reversed but had the result. same issue on the same side. has anyone come across this problem?