changing rear differential fluid
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
I got to do the same, change out the rear more so now, i,m getting some new sneakers for my ride and i did a burnout and one wheel only spinned(right rear). I guess its time for me also to change out the diff-fluid.? Sorry for the hijack.
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
Change the fluid then taker her for a test drive. If she chatters or gives you issues you can add a couple of oz at a time of the friction modifier. Some synthetic fluids do not require the friction modifier but occassionally they need it also (like 1 in 200). If you think you are having issues you can send in an oil analysis of the fluid.
Mike, if we hook up in June I will grab a sample of your rear diff and send it into the lab to see how she is holding up.
Mike, if we hook up in June I will grab a sample of your rear diff and send it into the lab to see how she is holding up.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Not sure what you are waiting for that has not been said. If the diff is fine, then consider it PM. If it isn't it may help. I will say that my fluid was pretty crappy looking but exhibited no symptoms. Just remember the diff is like the tranny with slipping clutches etc that give off residue that was suspended in my old fluid. Having said that, you could run the stock unit to well over 500k and not have a problem. Up to you.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
If you like Rich. Look forward to meeting you this time.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Posting Guru
Joined: Oct 2007
Posts: 1,130
Likes: 0
From: Bloomfield Hills, MI
I changed mine About 10K after i got the truck. used 5 bottles of mobil 75W1?? (i think 140) full synthetic. Also sanded the pan down and brake cleaned the hell outta it. Put about 12 layers of high heat paint with one layer of a tough enamel on the outside. Used black with orange high heat RTV. Looks pretty cool. get alot of comments on the oozing orange RTV lol So far- so good. I didnt use any friction modifier per the guy at ford looked up VIN and said i dont need any. (no locker or somthing?)
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Who cares? You know how I feel about OAs anyway. I'm not going to start the hand wringing regardless. When it quits, I will fix it.
Post Fiend
Joined: Sep 2006
Posts: 7,426
Likes: 6
From: Sioux Falls, SD
Just looking for an excuse to drop by & have a few
..SOrry to
Thread
Thread Starter
Forum
Replies
Last Post
dgruhlke
2007 - 2014 Expedition & Navigator
3
May 1, 2012 11:22 AM
DudesRUs
Clutch, Transmission, Differential, Axle & Transfer Case
3
Jan 13, 2005 01:12 PM
