Transfer case question?

[emsherer]

My 85 k10 had solid hub covers on the front axle when I bought it,full time front axel engagement. I installed the lock/ unlocked hubs. Then I heard that my transfer case has to always spin for lubrication. I'm guessing that's why for the full time hubs? Any thoughts will be appreciated. For now I just leave the hubs locked.

 

[Strick]

There's an oil pump eccentric in the NP208 that is going to lubricate the case regardless of what hubs are in the front axle. Your truck may get a little better mileage with the manual locking hubs as well.

HS

 

[Grit dog]

Need to know what t case is in your truck first.
Guess would be someone swapped in a full time front axle. More likely than someone swapping in an old 203 t case AND a FT axle.
But if it is a 203 see if it’s been converted to run PT.

NP 203 is the only FT case GM used on these trucks afaik.