[jblair1082]

2011 f350. Rear differential is hot smell gear oil
No seals leaking axle tubes are cool but rear differential is to hot to touch. Any suggestions

 

[Maryland dieselnick]

Ummm… How many miles? How often was oil changed? What has it service ( duty) life been?
Who last serviced it?
Pop it open, drain into clean pain and see what is going on.

 

[jblair1082]

Ummm… How many miles? How often was oil changed? What has it service ( duty) life been?
Who last serviced it?
Pop it open, drain into clean pain and see what is going on.

135k miles. I recently popped the cover off because of the excessive heat looks great no metal cleaned it up and replaced gear oil checked vent and it was not clogged. Truck has a utility bed and my daily driver

 

[Maryland dieselnick]

Do you know for a fact that the oil you drained out was the correct oil?

 

[jblair1082]

Do you know for a fact that the oil you drained out was the correct oil?

No. But I’ve been driving the truck for 2 years with no problem when i replace tje oil i used lucas thinking it might help. Do you think maybe pinion bearing going bad?

 

[Maryland dieselnick]

Lucas what? Gear lube additive?
You said gears looked good. Was the wear pattern on the ring gear teeth, proper?
Did you measure or feel the backlash between the ring gear and pinion? Have you tried to rotate the pinion flange some to feel for how free it is?
Have you looked up the correct spec for oil in your differential and if it needs a friction modifier ? Adding additives to differentials that have friction locking devices ( I do not know that you do), is not a good idea unless it is the friction modifier called for by the manufacturer.