hey i have an 05 f150 with the 8.8 and 3.55s.well im lifting so 3.55s have to go.im going 4.56.well what i was wondering is do i need a different diff cover to clears the gears?i would assume yes but i dont know.i also wanted to ask im getting a guy from my work to do the swap.other than the ring and pinion and oil is there anything else i would need at least anything special?i work at a ford dealer so getting parts isnt that bad but im not sure if aftermarket gears require aftermarket parts or whatnot.thanks in advance.

 

I would suggest looking on Randy's Ring and Pinion's site. They sell a master install kit, you will need one for the rear AND a seperate one for the front. They come with all new Timken bearings, seals, and everything you need. The MASTER install kit is what your looking for.

I don't think a bigger cover is needed. I could be wrong, I am not 100% on it, but why not ? Its fairly cheap, add a ton more fluid which = lower operating temps which = longer life. Go with a Mag Hytech dif cover. I got one, they are sweet. Come with drain plug, and even a dipstick ! They look great too.

here ya go : http://www.ringpinion.com/

 

Agreed get a master install kit for both the front and rear. Btw you won't need a new cover.

 

sounds good then.btw i have 2wd.no front thank god.too much money lol.thanks guys.

 

also i went to the site and looked at the master install kit and im wondering is anything in this kit better than what i can get at work.id hate to pay full price for parts if i dont have to.the only thing would be the ring and pinion gears and rear cover that id get aftermarket.i mean unless these items are specific for 4.56 gears id get parts from work.let me know if im wrong.i do appreciate the feedback i have been getting for all my questions.

 

Hey 99 ford man what is your rpm at 65mph?? You have almost the same tire size as you and Im thinking about 4.10 or 4.56 and I use the truck to tow and commute 50 miles to work so Im tring to weigh the options....thanks

 

I also have the 3.55's now does that make the truck slower or faster? I see some have the 4.10's with their's?? Pros / Cons?

 

italiano: you only need a ring and pinon set and a master install kit. Mercedes is right, the cover looks awesome and I would get it, but its not necessary like the other two things I mentioned.

NARC: 3.55 doesnt necessarily make your truck go faster or slower. It depends on what size tires you have on there. Ford put 3.55's in there from the factory to give you a balance between power and mpg's with the tire/wheel combo that came from the factory.

If you:

1.) got 4.10's and left tire size the same=more oomph off the line- FASTER
2.) got 4.10's AND moved up in tire size (33's) =compensating for engine load with gears- SAME

 

italiano: You don't NEED timken bearings and better seals, but I would suggest it. If you could get brand new Ford bearings that work, you could do that as well. Make sure you have all new bearings AND seals.

Narc: I agree with tnsilverfx4. The lower number (higher gear ratio) allows for more top end speed (although our trucks come with a 99mph governor, unless tuned). It makes it harder for the truck to get off the line tho, and start moving. The higher gear number (lower ratio) allows for more torque at the wheels right away, giving up some top end speed, for "off the line oomph".
Think of it like your mountain bike. You could have the "higher" gear, making it harder off the line, but you can get flying once your moving. More work for the engine (you). Or you could have the "low" gears, and peddle all you want and not move very fast, but no one could hold you back, and you could go up some pretty steep hills with ease (less work on the engine, more power, or torque at the wheels).

 

Thanks guys good info.