35,000 miles
Cargo Master
Joined: Aug 2002
Posts: 2,013
Likes: 6
From: Cajun Country
Unless you have submerged the rear end in water,you're good until 100k miles or more.I'm not too familiar with the Ford 5 speed,which uses MerconV fluid,but if it were mine I would have changed it at 30k miles.
Laughing Gas
Joined: Mar 2000
Posts: 1,191
Likes: 0
From: USA
So that mean we are good for 100K on the Front Diff as well? What about the T-Case?
Senior User
Joined: Apr 2008
Posts: 411
Likes: 0
From: Fort Collins
T-case is set for 150,000 miles unless it's an off-road truck, then it's 60,000 miles too.
Can't find anything other than to inspect the fluid on the front diff, so I'd change it at 105,000 miles like the rear diff. Cheap insurance.
Can't find anything other than to inspect the fluid on the front diff, so I'd change it at 105,000 miles like the rear diff. Cheap insurance.
Elder User
Joined: Dec 2007
Posts: 680
Likes: 0
From: Michigan
I just changed all my driveline fluids at 90k, both diffs and T-case. T-Case fluid was a little brown, but other than that, it is cheap insurance. Very easy to drain and fill, so I would do it when you do the axles.
Senior User
Joined: Apr 2008
Posts: 411
Likes: 0
From: Fort Collins
True. If you've got the time, and the money for it, it's cheap insurance to throw them all together...
