Fluid changing time

[Uncle Fester]

Hey all,
Okay, it is time, probably past time, to change the fluids in my drive train, axles, tranny and transfer case, my queston is, what goes in each one....as in what type of fluid? Axles get 80/90, that one I know, but what about the tranny (SM-465), and transfer-case (NP-205)?
Next, the drive train has around 150K miles on it, so should I use dino juice or synthetic oil? Should I add LUCUS, Slick-50, STP, BG Multi Gear Concentrate , or ? ? ? ? ?

 

[tRustyK5]

80W90 for all...

Rene

 

[Uncle Fester]

Thanks

 

[rjfguitar]

I reccommend synthetic. It provides less resistance to reduce drivetrain power consumption, bumps mileage up, protects everything better, and lasts much longer.

If all you are going to do though it plow through the mud and water anyway, probably just dyno oil and change it every year.