Ok guys, just bought 95 f150 xl with 300 6 cylinder. 85000 original miles. Going through truck and changing all original fluids. Trying to figure out what to use for rear end fluid. Parts store told me i need to get ahold of dealership with vin # to figure out what type of rear end it is. Does anybody know what type of fluid i might need to use?

 

I just went through this too.

Do you have a manual for your truck? It will tell you what you want to use and how much. My manual referenced all F series, so I looked at the sticker on the inside of the drivers door on the cab. You will see an axle code. Mine was H9 which is a 3.55 LS. The manual stated 5.5 pints of 80W90.

 

75w-90 Synthetic

 

I looked at the axle code on mine and it says 18. But im not seeing that in my manual anywhere.

 

3.08 gear not a limited slip axle 75-90w will be ok

 

Found it, mine is 5.5 of 80/90. + 2 oz of friction modifier.

 

Doing a search lists the 18 as a 3.08 non limited slip. Your manual should have a chart with that rear end listed hopefully.

 

Ok thanks for the help guys.

 

If you use synthetic gear oil with a non limited slip, you shouldn't have to get friction modifier. I didn't use any with mine and it works well. With regular 80w-90 you may need it, but I doubt it in that instance as well because the formulation has greatly improved since the truck was built nearly 20 years ago.