Just a follow up after a year long silence.

I used 76 Lubricants MP 80w90 gear oil, and replaced the Transfer Case, and Differentials.

The Disco certainly needed that fluid change, and it seemed to help with the occasional ABS system coming on less (my ABS light is on, and I need to check sensors, which is next on my list).

 

I am still running the royal purple 75/ 140? Seems great other then the price

 

benefits of formerly working in the petroleum industry... $4 a quart for the gear oil

 

Yeah think the royal purple is like $22 qt. But noticible difference in cold weather