Im looking for a new diff cover for my rear. I drive a 2003 F150 5.4 with a 3.73 Limited Slip. What kind of cover do i have? Thanks for any help.

 

Most likely have a 9.75 rear diff

 

Ya the 5.4 has a 9.75 rear diff you can count the bolts to be sure though

 

Count the bolts,12=9.75 10=8.8.

Don't go based off of your motor size,ford did some odd ****.

 

Thank you for all your responses. My next question is what type of bolts are used. I'm buying another cover to be powder coated and want to get hardware also to be painted. Last question i promise. When i refill my differential how fluid is used. I really appreciate all the help.

 

Agreed! I've seen some funny stuff going on haha...

To the OP, what are you building a show truck? Lol rattle can that stuff! Haha...

Naw if I lived in Texas I'd probably break out the paint guns and expensive paint to paint components... but around here with the salt and chemicals I paint my frame and everything every spring with a few cans... winter does a number on trucks around here :/ no use in spending time and $$ to make things pretty when you hafta do it every spring regardless of what you use, I made a mistake and used expensive primer and paint on all my custom components as well as axles n such when I built my truck only to have it get ruined over a few winters...

 

You can make a show truck with cans lol. I started sprayed stuff under mine and it looks brand new

 

Yup I do it every year

 

Im finally getting around to new diff cover since im about to replace my diff fluid. Will these bolts work with my new cover?

http://www.jcwhitney.com/spectre-uni...d18911y2003g55

If link doesnt work here is the product number: JCW-993274

 

The rearend bolts are the only standard sized bolts on the entire vehicle. IIRC there 5/16-18.

In my experience ALL 5.4L had 9.75" and all 4.6L had 8.8"

Some advice is do NOT go with a chrome cover, they retain heat. A aluminum cover is best as it dissipates heat much better. I like the Off Road Unlimited, Mag-Hytec, & TA Covers.

I had a TA on my 2003 and have a Mag-Hytec on my 2013.

DONT FORGET THE FRICTION MODIFIER IF YOU HAVE A LS DIFF!

Wayne