Topic Sponsor
2004 - 2008 Ford F150 General discussion on the 2004 - 2008 Ford F150 truck.

2004 FX4 Rear Gear Ratio 3.55 or 3.73 Stock?

 
Old 01-28-2017, 11:22 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Jul 2016
Location: NC
Posts: 158
Liked 7 Times in 7 Posts
Default 2004 FX4 Rear Gear Ratio 3.55 or 3.73 Stock?

I'm learning a ton on this site about my truck and getting great information on repairs. Here is another question about the rear end

I'm getting ready to do the seal/bearing and I read about the axle ratio here. In the 04 FX4 I read that the rear axle is a 3.73 factory stock. The code on my door is H9 which I looked up and it says it's a 3.55.

Did I buy a used truck that is not an FX4 but one that someone stuck the stickers on when they bought it, they traded it and I bought it as such when it is not? How do I tell, take the VIN to a Ford dealer and ask them what I have? I checked a Ford site and it says it has a 3.73 according to the VIN. Now I'm confused. The VIN says 3.73, the axle code says 3.55 on the same sticker. The VIN also says it has black clearcoat paint (its silver) and it's an STX not an FX4. The dash VIN matches the door sticker and if someone painted this truck they did one heck of a job as I can see no black or silver overspray anywhere like inside the wheelwells, firewall, etc. I started to pull the paint out of the bed to put spray in bedliner and there is no black to be seen just silver and primer. The front badges on the fender say "F150 XLT 5.4 Triton"

Was it a special order, maybe, or did I buy something that it was not? Other than the timing job the truck was immaculate and appeared well cared for. The only maintenance item that popped up was that it was taken into the dealer and the mechanic broke a sparkplug off, like that has never been done on these trucks before, necessitating pulling the engine or removing the head. I'm thinking thats worst case scenario as they most likely vacuumed it out.

Please do not tell me I got had....Actually, tell me. Maybe I'm not reading the VIN right.

I looked at one site that maybe is not correct in decoding the vehicle then
I also checked here http://www.fleet.ford.com/resources/...er/VIN2004.pdf and the numbers match up all the way to the specific vehicle 12-17 AXXXXX. The paint code "YN" says silver, VIN says black.

It's the axle code that gets me. How do I tell exactly what this truck is and what is with the axle code?

Last edited by diver64; 01-28-2017 at 12:15 PM.
diver64 is offline  
Old 01-28-2017, 01:15 PM
  #2  
Member
 
bbrad1775's Avatar
 
Join Date: Jan 2014
Location: Corpus Christi
Posts: 874
Liked 50 Times in 45 Posts
Default

For an open diff, jack up one tire, spin wheel 2X and count pinion/driveshaft rotations. If it doesnt spin then it has LS

For LS, jack up both tires, spin wheels 1X (both wheels will spin together) and count pinion/driveshaft rotations.

As for the VIN, are you using the vin printed on the sticker or off the windshield?
bbrad1775 is offline  
Old 01-28-2017, 02:59 PM
  #3  
Senior Member
Thread Starter
 
Join Date: Jul 2016
Location: NC
Posts: 158
Liked 7 Times in 7 Posts
Default

Mark the drive shaft and count the rotations when I rotate the tire once. That I can do.

I cross checked the door VIN with the dash/windshield. They are both the the same.
diver64 is offline  
Old 01-28-2017, 03:58 PM
  #4  
Member
 
bbrad1775's Avatar
 
Join Date: Jan 2014
Location: Corpus Christi
Posts: 874
Liked 50 Times in 45 Posts
Default

Strange. STX models had a specific trim package I think as well as FX4 models. Also STX can be 4WD. So to answer your question, I still have no idea what model it actually is.
bbrad1775 is offline  
Old 01-28-2017, 06:54 PM
  #5  
Senior Member
 
Join Date: Sep 2016
Location: Weedsport NY
Posts: 156
Liked 12 Times in 12 Posts
Default

I think there were 3 possible ratios offered so that is one possibility. The prior owner could have changed gears also. The easiest way to know for sure (at this point does it really matter) is to pull the diff. cover and check the ratio stamped on the gears.

Greg
gmb13 is offline  
Old 01-28-2017, 07:43 PM
  #6  
Member
 
Join Date: Apr 2016
Posts: 89
Likes: 0
Liked 3 Times in 3 Posts
Default

Can pictures be put up if the truck? That might help some
Turdferguson391 is offline  
Old 01-28-2017, 10:59 PM
  #7  
Member
 
bbrad1775's Avatar
 
Join Date: Jan 2014
Location: Corpus Christi
Posts: 874
Liked 50 Times in 45 Posts
Default

Originally Posted by gmb13 View Post
I think there were 3 possible ratios offered so that is one possibility. The prior owner could have changed gears also. The easiest way to know for sure (at this point does it really matter) is to pull the diff. cover and check the ratio stamped on the gears.

Greg
You don't have to pull the cover to check the ratio. Just follow the steps I posted above.
bbrad1775 is offline  
Old 01-29-2017, 07:42 AM
  #8  
Senior Member
Thread Starter
 
Join Date: Jul 2016
Location: NC
Posts: 158
Liked 7 Times in 7 Posts
Default

The door sticker looks like the standard factory sticker and does not appear to have been replaced. The VIN on the sticker matches the windshield/dash one. I'm just wondering if I overpaid for it. The truck looks like the other FX4 I've seen and the dealer I took it too once didn't bat an eyelash at it.

I was not aware that they came with 3 axle options. I just want to know what I have. Is there a picture here of the instrument cluster to match against mine as I think the FX4 had a different one than the STX?
diver64 is offline  
Old 01-29-2017, 08:18 AM
  #9  
Member
 
Join Date: Apr 2016
Posts: 89
Likes: 0
Liked 3 Times in 3 Posts
Default

It's the back diff 12 bolt?
Turdferguson391 is offline  
Old 01-29-2017, 09:12 AM
  #10  
The Anti-Chrome
iTrader: (2)
 
Summers22's Avatar
 
Join Date: Feb 2014
Location: Kansas
Posts: 16,027
Liked 3,339 Times in 2,480 Posts
Default

Post a picture of your door sticker. You know, the one with the VIN that has the barcode under it.
Summers22 is offline  

Thread Tools
Search this Thread

Contact Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: