2007 Peterbilt 379 Hot Rear End

Is the inte-axle switch being left on or if the switch is off, is it actually disengaging?

 

An 07 is pretty new to have worn out bearings, does the axle have the internal pump? some do and if the pump quits working for what ever reason it will cook the rear ends.

 

Normal procedure would be to take an oil sample from the drain on the differential and check the magnetic drain plug for metal fragments/chunks.

 

Which drive axle is overheating?

 

might want to call your pete dealer and have them check to see if this truck falls under a campaign they had a year or 2 ago, for loose ring gear bolts, but definitely need to get it checked out before it goes boom.

 

It splits the power between your axles, and it is the deal that when you use the inter axle lock that locks up so both axles spin at the same speed. it has a differential just like your axle so the truck can turn easier, with the divider being locked up it means your rear and is getting one heck of a workout and it may be burnt up

 

Do you have a big difference in tire tread depth between the front and rear drive?