Help diagnose my problem

[Ryan2286]

On initial acceleration a rythimic clunking and clanking is heard. After that while maintaining a speed of 35, or any speed for that matter, and more throttle is applied a low hum and vibration can be herad and felt. But once a steady speed is achieved the vibration and hum goes away. My trans fluid is still red, my t-case has enough oil and my diff was just oil changed 4 months ago. If the transmission is put in park or neutral the motor runs like normal under all throttle positions. What are some things I can do to determine the problem. Thanks for any help
-Ryan

 

[jc71355]

Check your U-Joints

 

[88sub4x4]

Does it sound like metal on metal? Almost like a tinny noise? /forums/images/graemlins/burb.gif

 

[Ryan2286]

I just replaced my driveshaft to diff u-joint two weeks ago, perhaps its the top one thats causing the problems now

 

[Ryan2286]

yes it does, sound like a tinny noise, initially, then it turns into the deep vibration. but in like the first gear under acceleration yes it sounds like metal clanking on metal

 

[jc71355]

I had similar conditions w/ a very fast vibration and It ended up being the upper U-Joint. Found that out when it blew going 70 on the Highway /forums/images/graemlins/eek.gif

 

[sdavid]

Sounds like a U-joint. Also check to make sure the end you just replaced is still tight and no loose bolts that hold the U-Joint to the diff.