been getting vibrations issues over 70mph(and I can feel it very slighty at 60ish), What should I check? Front DS been rebuilt, rear rotorflex was replaced(old one was in really bad shape), still there, balance and rotated tires, still there. also I have clunking noises when I go from like drive to reverse, and when crusing and slighting taping the gas I can hear it clunk.

any advice? im going to try to remove the drive shafts and see if it goes away.

 

Sounds like a diff issue, or a bad cv

 

or the ball joints are completely shot and your wheel is about to snap off the next time you make a hard left. I experienced a faulty ball joint that manifested itself in a variety of symptoms, 1 of them a shaking sensation at freeway speed, espc' when contacting something like 1 of those large cracks/pothole/lane dividers/etc

 

mans the damn things aren't greasable!!!!! Joe I'm guessing u are up
working

 

happy to report that I haven't needed to work on my truck since Sunday. My buddy lent me his OEM LR fan clutch so no fan/cooling problems since installing that; it was like 5 or 6 brand new Import Direct HD units part #2991 from O'reilly Auto Parts that have a manufacturing defect. I was driving myself crazy looking at my belt drive & everything associated with it. After replacing the water-pump, PS pump, belt-tensioner pulley, AC comp' bearing, idler pulley bearing, having the alternator bench tested....it turned out to be a whole run of bad viscous clutch units. SOAB!

 

turns out its the front driveshaft, Took it off and it went away, the front U-joint at the diff, has about 1/8 of play.... ouch. so im getting it rebuilt again and balanced.

 

Skip the rebuild and get a better shaft, with greaseable joints

 

It was already rebuilt with greaseable joints.

 

Consider yourself a lucky bunny, if the front UJ's disintegrate the driveshaft flails around and it usually means a wrecked autobox also.

You have to ensure the driveshaft is regularly greased at least twice a year until you see grease emerging from the UJ's otherwise they knack out very quickly.

 

so I got the driveshaft back from the shop, installed it and my vibrations are gone, so problem sloved.