Transfer Case OIl
FTE Chapter Leader
Joined: Jan 2006
Posts: 21,365
Likes: 8,079
From: North Central Washington
Originally Posted by fordtrucksforever
Yes the 80/90 works for both. Depending if all fluid is completely drained. At about $8 a gallon, two should get everything with some to spare.
Tim in Chelan
Lead Driver
Joined: May 2000
Posts: 9,236
Likes: 12
From: Senoia, GA
in gear driven cases (Dana 20, NP205, etc) heavy weight (80/90) is recommended to help coat the bearings and keep them coated. in real cold areas such as northern states that see negative temps a thinner weight is recommended so that as the temps get colder the oil can stil get in the bearings and keep them coated instead of the oil gettin all syrupy!
in chain driven cases (np208, np203, etc) tranny fluid is recommended b/c the chain is harder to get oil coated on the inside so they use a much thinner oil. otherwise the chain would burn up
-cutts-
in chain driven cases (np208, np203, etc) tranny fluid is recommended b/c the chain is harder to get oil coated on the inside so they use a much thinner oil. otherwise the chain would burn up
-cutts-
Tuned
Joined: Aug 2002
Posts: 476
Likes: 1
From: Greatest state on earth
One real problem with using 50W oil. Its readily available. I use it in a high milage truck just to keep oil pressure out of the red. Good truck, but very loose inside. In the Dana 20 transfercase, it will leak all over the place. The bearing plates and shafts are not gasketed, glued, or oringed. With the milage on these, you have clearance. And then there is a big mess everytime you stop. Next time I go thru one, its getting grooves cut in the shafts for orings and figure a simple way to seal the shimmed bearing plates. I really hate to silicone all of these pieces.
Postmaster
Joined: Dec 2002
Posts: 3,594
Likes: 2
From: Southern Oregon USA
If the surfaces are clean, silicone works great on the endplay adjustment shims and will last a long time.
50 Wt Transmission oil (not the same as engine oil) is the factory recommendation for transmissions and transfer cases. I've used both and the only time I may have noticed a difference is in extreme cold conditions -30 deg F.
Jason
50 Wt Transmission oil (not the same as engine oil) is the factory recommendation for transmissions and transfer cases. I've used both and the only time I may have noticed a difference is in extreme cold conditions -30 deg F.
Jason
Thread
Thread Starter
Forum
Replies
Last Post
tlbranth
1987 - 1996 F150 & Larger F-Series Trucks
20
Apr 26, 2014 08:51 PM
pcguy760
1997 - 2006 Expedition & Navigator
7
Nov 20, 2008 10:48 AM
