Frint & Rear Differential Fluids

[victorysail]

Went for an oil change the other day in one those dirve thru places and the guy in charge said that my front and rear differential fluids need change.
Mine is a '97 4.0L SOHC with only 92,000Km (or 56,000 miles), and also my fan and assessories belt need change ?
I remember I read somwhere that the differential fluids need not be touched unless your truck happens to immerse in water.
Any body remember how long is the differential fluid is supposed to last ? Or, how long should the fan belt last ?

 

[Bronco638]

I think the recommended interval for the fan belt is 40K miles. As for the diff fluids, if they're synthetic, they should be good for 100K miles (as long as they're not contaminated). Even if they're not synth, you should be fine at 56K miles. You may want to check that the diffs are topped off, though.

Hope this helps - Dave.