Upgraded Differential on 2nd Gen?

Discussion in '2nd Gen - 2003 - 2006' started by Vancouver Bob, Nov 9, 2017.


  1. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA

    Thanks!! I've stumbled across the Yukon in my searching and is definitely a possibility. Had hoped to be able to get one of the selectables to work and not ready to throw in the towel just yet :).
     
  2. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    Thanks, JE070! There are definitely some good LSD options out there.

    Anyone know if a limited slip is compatible with Advanctrac? I have read that the Expeditions with Advanctrac all came with open differentials, perhaps to keep the systems from fighting with each other?
     
  3. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    I have 3.73 gears but was disappointed when I discovered I have an axle code of 16..

    Code Gear Ratio (L - limited slip, C - open differential)
    15 3.31C
    16 3.73C
    17 (1997) 3.73C
    17 (1998) 3.55C
    17 (1999-2002) 3.31C
    19 3.55C
    H5 3.31L
    H6 3.73L
    H7 3.31L
    H9 3.55L .
     
  4. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    Thanks! The 9.75 TrueTrac they show is designed for that C-clip retained solid axle used on the F-150's. Same with the ARB. They say I'd have to have the side gears modified to get it to work.
     
  5. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    Thanks!! I didn't see this until just now. I think I cut and pasted from the same site :).
     
  6. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    Just found this...

    According to Ford, a 2004 4X4 with advance trac cannot use a limited slip differential. I deal with lots of snow (Canadian North) and have felt that when stuck in deep snow a standard axle would not provide more than 1 drive wheel in the rear and 1 in front. According to the owners manual when things get tough they recommend turning the advance trac off for better traction in deep snow or mud. For this reason I have factory ordered a 2004 "without" advance trac and "with" limited slip rear axle.

    Can personally attest to the comment about better traction in snow/sand with advance-trac off.
     
  7. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    So if I believe everything I've read... my only option would be a selectable locker since I can't run an LSD with the Advance-Trac.
    Ha ha... funny about not being a wizard on rear axles! :)

    That ARB RD-150 was first touted to fit up to the 2003 Expeditions but as I looked deeper some places said it did and others said it didn't. Called ARB and that's when the guy told me about the differences in how the axles were retained. Without the locking feature in the side gears the half shafts would potentially slide out over time.
     
  8. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA

    I'm guessing it was the RD-150 because it's designed for the 9.75 34 spline axle. I'll search around some more, thanks!
     
  9. blue oval guy

    blue oval guy Member

    Posts:
    17
    Likes Received:
    0
    Joined:
    Apr 22, 2013
    Location:
    French Camp, CA
    I don't know but my 05' in 4 low is an unstoppable beast in the snow even without a rear locker.
     
  10. Vancouver Bob

    Vancouver Bob Full Access Members

    Age:
    58
    Posts:
    354
    Likes Received:
    124
    Joined:
    Dec 22, 2016
    Location:
    Vancouver, WA
    I hear you... in general I totally agree! Just a few times where I've had opposite corners spinning and I was completely stuck. Once on my driveway! The neighbors helped push me out. And as they were pushing they asked, "Doesn't this have 4 wheel drive?" :). I've had similar challenges in the sand. Even having an LSD would have been nice.
     

Share This Page