Ok. Just saw your original post...

"Originally Posted by tayous1
I been having a little problem with my truck when I drive it down the road it sounds like someone placed a baseball card in the spokes of a bike ... Other weird thing is it stops making the noise when I turn on the 4x4. Yet when I turn the 4x4 on the rear tire makes a thud sound."

Originally, you said it stops when you put it in 4WD. Now you say it only happens while in 4WD. I’m confused. The thud is normal. It's just the transfer engaging (as long as it's not a major THUD!).

The card in the spokes noise (while in 2WD) is symptomatic of a bad IWE solenoid, a bad check valve in the vacuum line or a bad IWE actuator on one of the front hubs.

A card in the spokes noise while in 4WD (4X4) coming from the left rear is just weird. I have no clue. Sorry.

Maybe XJCamaro or TN 150 have an idea. Good luck.