RE: Driveline clunk 2005 silverado
Unbolt the drive shaft, slide it out, grab the U-joints firmly and wiggle and shake the sh*t out of them. There shouldn't be any play in either of them. You might have a grease fitting on one or both U-joints. If so grease em. Throw a glob of the stickiest grease you got into the slip yoke, (about a silver dollar-sized amount tops). Finger it around like it was the girl you used to date in highschool and throw it back together. Smoke a cigarette if you got one.
99' Silverado 5.3 4X4
Modified Predator 93 tune: TQM @ 40%, injector slope bumped up 4 levels,
125 MPH top speed, 5500 RPM limit,
TBS, 180 thermostat, 4" CAI with 9x6" element,
Bypass and De screen performed,
AVG: 16 MPG City, 20 MPG Highway