Go Back  F150online Forums > F-Series Trucks > 2004 - 2008 F-150
2005 stx 6 lug 4wd rear differential size >

2005 stx 6 lug 4wd rear differential size

2004 - 2008 F-150

2005 stx 6 lug 4wd rear differential size

 
  #1  
Old 07-10-2019, 09:03 AM
Junior Member
Thread Starter
Join Date: Jul 2019
Posts: 4
Received 0 Likes on 0 Posts
2005 stx 6 lug 4wd rear differential size

Hey folks,
I have a leaking rear differential as well as a leak coming fron the left sode of the axle. I am somewhat mechanically able but a differential rebuild is far beyond my skillset. I am wanting to get the differential replaced. I am pretty sure it is a 3.55 gear ratio but the door sticker does not say. What do i need to watch out for when looking for a new rear end? Are there any other models compatible with mine? Im trying to save as much money as possible so this will probably be a junkyard pull. Thabks in advance
 
  #2  
Old 07-10-2019, 09:38 AM
Senior Member
Join Date: Jan 2002
Location: Wilmington,NC
Posts: 4,731
Received 4 Likes on 4 Posts
There is an axle code on the door jam sticker that will tell what ratio it is and if it has traction lock. There should be a couple of tags on the rear diff cover that will tell you the ring gear size and if it is a TL rear. There are also axle codes on those stickers. Read the door tag axle code and the rear diff tag codes an post them here and we will be able to tell you what you should have.
 
The following users liked this post:
  #3  
Old 07-10-2019, 11:39 AM
Senior Member
Join Date: May 2005
Location: Broken Arrow, OK
Posts: 2,148
Received 2 Likes on 2 Posts
I'd think just having a shop repair the rear end is going to be cheaper than buying a junkyard rear end (probably just a blown seal). I'd have it looked at first before you start calling around to junkyards for rear ends with unknown histories and the PITA it is to get it all swapped over.
 
  #4  
Old 07-10-2019, 12:23 PM
Technical Article Contributor
Join Date: Jan 2007
Location: Vernon, NY
Posts: 9,008
Received 12 Likes on 12 Posts
x2

The only time a new (reused) axle is recommended is if it's bent, or something way beyond repair.

Take it to a shop that works on rear ends.
 
  #5  
Old 07-10-2019, 02:21 PM
Senior Member
Join Date: Sep 2009
Location: The Shenandoah Valley
Posts: 2,703
Received 3 Likes on 3 Posts
You talking about a pinion seal leak maybe?

And a leak on left side? Axle tube to center casting or at vent or at axle end where brakes are? It's not abnormal to see dampness at the first two, like a misty look. If axle lube leaking at seal and you see it on tire, that's an axle seal needs R&R.

Our Mustang was leaking or seaping at the pinion seal, I changed vent (had a cap with light spring over disc to relieve pressure) to just a hose run up into frame in a loop, no cap, no more seapage either.
 

Last edited by tbear853; 07-10-2019 at 02:24 PM.
  #6  
Old 07-10-2019, 02:51 PM
Junior Member
Thread Starter
Join Date: Jul 2019
Posts: 4
Received 0 Likes on 0 Posts
Originally Posted by Roadie View Post
There is an axle code on the door jam sticker that will tell what ratio it is and if it has traction lock. There should be a couple of tags on the rear diff cover that will tell you the ring gear size and if it is a TL rear. There are also axle codes on those stickers. Read the door tag axle code and the rear diff tag codes an post them here and we will be able to tell you what you should have.
Looks like the code is 4U5A1532AATLU
 
  #7  
Old 07-10-2019, 02:51 PM
Junior Member
Thread Starter
Join Date: Jul 2019
Posts: 4
Received 0 Likes on 0 Posts
Originally Posted by tbear853 View Post
You talking about a pinion seal leak maybe?

And a leak on left side? Axle tube to center casting or at vent or at axle end where brakes are? It's not abnormal to see dampness at the first two, like a misty look. If axle lube leaking at seal and you see it on tire, that's an axle seal needs R&R.

Our Mustang was leaking or seaping at the pinion seal, I changed vent (had a cap with light spring over disc to relieve pressure) to just a hose run up into frame in a loop, no cap, no more seapage either.
Yeah its leaking from front but diff. Case has a crack in it too. To be honest i have no idea its been that way
 
  #8  
Old 07-10-2019, 02:52 PM
Junior Member
Thread Starter
Join Date: Jul 2019
Posts: 4
Received 0 Likes on 0 Posts
Thanks for the insight guys
 
  #9  
Old 07-10-2019, 03:32 PM
glc's Avatar
glc
glc is offline
Senior Member
Join Date: Dec 2006
Location: Joplin MO
Posts: 38,631
Received 7 Likes on 7 Posts
Originally Posted by Bigbigoon View Post
Looks like the code is 4U5A1532AATLU
That makes no sense. The axle code on the door jamb sticker will be 2 numbers or one letter and one number.

If you have a 4.2 or 4.6 it's a 8.8" axle, if it's a 5.4 you have a 9.75" axle.

The tag on the diff itself will have a 88 or 975 on it somewhere.
 
The following users liked this post:
 


Thread Tools
Search this Thread
Quick Reply: 2005 stx 6 lug 4wd rear differential size


Archive - 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: