Drive line noise

[jcwilliams]

I've got a 1998 ranger 4wd automatic trans that has some loud drive line noise while driving down the road. If I put it in neutral while its going down the road the noise goes away whether I'm on or off the gas.

If I let my foot off the gas the noise isn't there if I touch the gas again ( no matter to the floor or just barley tap it ) it comes back.
It shift great can't even tell its shifting unless looking at the tach.
Sounds like a semi going down the road.
Any ideas?
Thanks
James

 

[Syritis]

First thought would be low fluid, but that depends on the noise, if it's a knocking, whirring, a rattle?
does the pitch of the noise change with road speed or engine speed?

 

[jcwilliams]

Gets louder with speed it seems like. Hard to describe the sound other than it sounds like I've got some big ass super swampers on it.

 

[Syritis]

Check for u joint play. I know my colorado would kinda act that way in 4x4 and high speeds.
could also be cupping tires.