need help with vibration noise!

[dalmationdad]

got a 03 yukon that has a vibration noise from underneath.Only happens when it is under a load,like when accelerating or starting uphill. Can't tell exactly where it is coming from cuz it only happens when driving. maybe u-joints ? there is no clunking when shifting. need help!

 

[clean02tahoe916]

Vibration

sounds like its u joints. how many miles do you have on it? I have 124 on my 02 tahoe and i have not switched out the u joints yet. they seem to be holding together.

 

[dalmationdad]

got 120,000 on it , but they seem to be good, no clunk's putting it in gear or no high speed problems just seems to be when it is shifting with a load at low speed! Guess i'll try that first.