I have a 2004 F-150 FX4, SCREW. I am wondering if I have the 3.55's or the 3.73's. I will be putting 33 on next week and I hope I have the 3.73's. Also if I did order a set of the 4.10's what is a good price for the labor to install them. I have heard horror stories of problems after swapping out gears. Howling noises and truck never quit running the same. Must have been a bad install. Thanx in advance for any help.

 

Do a search or just look down through the threads. This topic is covered every day.

 

Thanks, I'll give the inside door sticker a look and see what I come up with.

Should have read a little deeper into some of the other threads.

I thought maybe all the FX4's had the same gears but that maybe isn't the case.

 

So I found the code - B6 - 3.73 limited slip. Going to be getting the 325-60-18 Extreme A/T's. Just from reading a few posts it sounds like I should be ok with this set up and going to 4.10's may be a waist of money. Any thoughts on this?

 

That's a little over a 33" tire. With a 5.4 I'd say don't bother with gears. If you had a 4.6 then maybe, but you'll still have plenty of ***** to run those tires. Regearing is expensive and I'd say unless you need it (or are into racing) then don't bother.

 

Thanx Jiggs, I'll post pics of the setup asap and how they effected ride quality, power, and acceleration.