06 f150 4x4 w/117k miles makes a grinding noise when letting my foot off the gas but today it stopped because I put it in neutral. I've had my passenger side actuator changed close to a month ago and was thinking it might be the driver side but why would it go away when I put it in neutral.

 

Same thing happened in one of my old Jeeps it ended up being the bearing on the rear yolk.

 

IWE actuated when U go to neutral the axle wrap up releases ? Does it go away off road/on gravel ? Front shafts chirp pr vibrate and feel loose .

 

I don't feel anything loose and I don't off-road. I use my truck a lot for work and mainly drive on pavement. I live in New Orleans so there's a lot of pavement. The grinding happens when my truck is pretty much coasting after I let off the gas, as if I might be preparing to break or even slow down a tad. I can also hear it out my window and it could be from the middle to the front. I thought it was my actuator trying to engage but all 4x4 system is in good shape and pretty much every part for it replaced. Maybe it is the slip yoke bearing, I'll have to check it out or bring it to my mechanic. If anyone can help verify or suggest what to look for or where to look I would greatly appreciate it. Thanks

 

Try driving off road to see if it goes away. Damage is already done if pumpkin is worn.

 

It doesn't stay "grinding", only once I a while

 

Some ppl saying slip yoke, now the pumpkin, I'm telling y'all what goes on when it happens son I don't have to bring it in

 

put your truck in 4H and see if the grinding noise goes away...

 

Since U have tried about everything maybe just hang it up under the bridge overnight will straighten it up some.