What is the rear end oil change interval for a 2005 4x4 f150? I did a search and came up empty handed.

Also I would like to know when should the tranny fluid be changed? I heard its a lifetime fluid, but thats kind of hard to believe.

Just curious...

 

This is from the owner's manual

Rear axle

"Your vehicle’s rear axle is filled with a synthetic rear axle lubricant and
is considered lubricated for life. These lubricants do not need to be
checked or changed unless a leak is suspected, service is required or the
axle assembly has been submerged in water. The axle lubricant should
be changed any time the rear axle has been submerged in water"

This is the recomended fluid should you need it:
"Motorcraft SAE 75W-90 Fuel Efficient High Performance Synthetic Rear Axle Lubricant"


This is from the Sheduled Maintenance Booklet:

Auto. Transmission
Change fluid at 30,000 miles for vehicles with model 4R100, all others inspect fluid.


The owners manual also states to use Motorcraft MERCON V ATF in the transmission. It also refers to a model 4R70/75 E-W transmission. (I assume this is 2 model numbers but I'm not sure).


Hope this helps.

 

Thanks. I appreciate it.

 

synth diff fluid should be changed every 100,000 km

Mac.

 

I believe the front/rear diff fluid specifications have now been changed. It should be 75W-140.

 

100,000 miles

 

Ok, cool. Thanks. Thats what I needed to know.

 

I reckon I should throw my owner's manual away.

 

With as much as that stuff costs, and the driving I do, I ain't messing with it until at least 100K miles.

 

I didn't start driving until 1962 and I've never changed the rear end grease and I have never had a problem. I seldom keep one over 180,000 miles and they never had synthetic in them.

 

i wish i had grease in my rear diff, i am jealous of you