Originally Posted by tmaxx
I have a 2003 29' Class C Ford E-450 with 50k miles on it. I tow a car behind.
As I understand I need to change the rear differential fluid. I am having difficulty finding which diff fluid to use. The tag on the diff cover is:
4.56 V2C24 BA
From below owners manual it looks like 80W-90 is the right diff fluid, correct? Some have mentioned using 90w/140 diff fluid but I can't find this anywhere.
I'm not sure capacity yet. Looks like it's either 3.1L or 3.5L.
I had to have mine changed out in Mexico due to a flood. Ford specifies a full synthetic which was $35 a quart and my f53 required 12, but they also say the diff is a lifetime lubricated item. No need to change. Guess I am not a believer in that and I changed it twice with semi synthetic 80/140 The hardest part on your will be getting the old oil out. My F53 had a drain plug but I think your class C 450 does not, You have to take the bottom bolt out of the cover and go take a nap and have a few beers while it drains. If possible save the oil into a clear container and let it settle. Water and other contaminants witll show up.