i was reading that when your axle is submerged underwater you are supposed to replace the fluid, i've submerged my axle and wan to change the fluid i have a 98 4.2 4x4 if anyone knows it'll help alot

 

just want to know what type of fluid

 

75W140 full synthetic, and if it has limited slip, a 4 oz bottle of friction modifier from Ford. Get the sealant for the cover at Ford too.

 

Your owner's manual will have the fill capacity & weight.

I just did mine with Royal Purple Max-Gear 75W140.

http://royalpurple.com/gear-oil.html

I had the work performed by my Ford dealership. I felt a little better about having the work done by a Ford trained tech and being covered by the Ford dealership's warranty. I paid for 1 hour of labor.

 

I used valvoline 75w90 and friction modifier. Works great and its synthetic.

 

Used Supertech Synthetic 75w-140. 3 Quarts at $10 each at Walmart.

 

The RP already has the friction modifier in it too...no need to add extra

That's what I plan on using when I finally install my Mag-Hytec.

 

cool thanks alot guys

 

cool thanks alot guys

 

just changed mine yesterday
used valvoline 75w140 synthetic
ford dealer told me to just run a bead of rtv gasket maker stuff around cover, hopefully it doesnt leak, haha ran it today and no problems so i should be alright

 

I don't think that it is nesercery to drain and replace the axle fluid after having it under water. If this was the case I would have to do that 10 times a week during the spring, summer and fall. I have had to replace axel in my life. 50 years of driving 4x4's.

 

I did not know that it already had friction modifer in it. Would I be hurting the gears if I did add the friction modifer from ford? Thanks Ben

 

Call Royal Purple, and see what they say. Then ask the same question to Ford.