Drive train noise while in motion

[adsm08]

No the ABS does not kick-in unnecessarily. But if it did, what is your thinking?

Al

Broken tone rings can cause blips in the wheel speed sensor signal making the computer think one of the wheels is locking up. It usually results in unwanted/unneeded ABS activation below 5 MPH and rarely in reverse.

 

[k3eaxk3eax]

Nails????? Why would nails cause the noise only forward and not backward???

 

[k3eaxk3eax]

Jim, I'll check the tone rings -- thanks.

Al

 

['99 EB Explorer]

Try putting the front end up on jackstands and rolling the wheels by hand. It could still be a u-joint or wheel bearing. I've seen parts on the brink of breaking(cracked or otherwise just "hanging in there") that would only be present if certain conditions were met...ie: driving forward, but would line up as if nothing was wrong in other situations...ie: driving in reverse.

If I were in your shoes, I'd be checking anything and everything that moves under that truck. Don't rule anything out.

Also: Does the noise match the vehicle speed or the engine speed?

 

[k3eaxk3eax]

Noise increases with road speed and not engine speed.

 

[lethal-threat-b288]

May b your tranny or tcase, check for any fluid leaks on the tranny and inside the rear wheels. Put it up on stands and shKe down each wheel. Then run it in gear I had that happen to me on my ranger and turned out to b my carrier bearing.

 

[gribly]

Jim, I'll check the tone rings -- thanks.

Al

I was thinking if one cracked bad enough it could have peeled out and part of it lodged in something, but if your ABS works fine, the rings are fine.