Was at the beach fishing last night and I put the truck into 4-lo and it sounds like I'm getting this rubbing noise from the driver's side of the truck. The diffs are locking up because I'm still getting traction, I just don't know what this noise is, any ideas? It's never done this before either.

 

only doing it when its in 4-low or is it doing it all the time now? (year, engine information needed as well)

 

It's a 2001 with a 4.7, the noise happens only in 4-lo, intermitenly in 4-hi. When I'm just driving in 2wd it's fine.

 

Could be a worn chain.

 

going for the obvious...

SAND?

IndyD

 

Not sand, I always wash the undercarriage down after I'm done out there. Plus this started just as I was going onto the beach so there couldn't have been any sand.

 

When was the last time you checked the fluid of the diff?

 

Checked the fluid the other day, it was fine. Actually changed the fluid about 10k ago.

 

Could just have been the torque on the diff trying to figure which wheel to go in the open gearing.