Notices
1997 - 2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Rear diff

Thread Tools
 
Search this Thread
 
Old Jun 2, 2012 | 06:16 PM
  #1  
Muddinexpedition's Avatar
Muddinexpedition
Thread Starter
|
New User
Joined: Jun 2012
Posts: 6
Likes: 0
Rear diff

I have a 99 expedition and when I turn I have some shutter from the rear diff could someone tell what is Cuasing it
 
Reply
Old Jun 2, 2012 | 06:33 PM
  #2  
5.4T's Avatar
5.4T
Elder User
Joined: Mar 2011
Posts: 817
Likes: 0
4x4? Or 4x2
 
Reply
Old Jun 2, 2012 | 06:35 PM
  #3  
Muddinexpedition's Avatar
Muddinexpedition
Thread Starter
|
New User
Joined: Jun 2012
Posts: 6
Likes: 0
Originally Posted by Muddinexpedition
I have a 99 expedition and when I turn I have some shutter from the rear diff could someone tell what is Cuasing it
And yes it is 4x4
 
Reply
Old Jun 2, 2012 | 06:43 PM
  #4  
Muddinexpedition's Avatar
Muddinexpedition
Thread Starter
|
New User
Joined: Jun 2012
Posts: 6
Likes: 0
Yes it Is 4x4
 
Reply
Old Jun 2, 2012 | 11:59 PM
  #5  
alwaysfords41's Avatar
alwaysfords41
Posting Guru
Joined: Feb 2008
Posts: 2,339
Likes: 0
Do you have the limited slip rear end? If so have you changed the fluid lately?
 
Reply
Old Jun 3, 2012 | 12:07 AM
  #6  
Muddinexpedition's Avatar
Muddinexpedition
Thread Starter
|
New User
Joined: Jun 2012
Posts: 6
Likes: 0
Originally Posted by alwaysfords41
Do you have the limited slip rear end? If so have you changed the fluid lately?
No I will do that thanks for the advice
 
Reply
Old Jun 3, 2012 | 12:44 AM
  #7  
5.4T's Avatar
5.4T
Elder User
Joined: Mar 2011
Posts: 817
Likes: 0
but what im trying to thin git might be the transfer case because when it turns but is it an AWD?
 
Reply
Old Jun 3, 2012 | 08:52 AM
  #8  
Muddinexpedition's Avatar
Muddinexpedition
Thread Starter
|
New User
Joined: Jun 2012
Posts: 6
Likes: 0
It has a4wd on the selector
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

 Verdad Gallardo
story-1

10 Best Ford Truck Engines We Miss the Most!

 Joe Kucinski
story-2

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

 Brett Foote
story-3

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

 Michael S. Palmer
story-4

10 Most Surprising 2026 Ford Truck Features!

 Joe Kucinski
story-5

Top 10 Ford Trucks Coming to Mecum Indy 2026

 Brett Foote
story-6

5 Best / 5 Worst Ford Truck Wheels of All Time

 Joe Kucinski
story-7

Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!

 Joe Kucinski
story-8

Every 2026 Ford Truck Engine RANKED from WORST to FIRST!

 Michael S. Palmer
story-9

The Best F-150 Deal of Every Trim Level (XL through Raptor)

 Joe Kucinski
Old Jun 3, 2012 | 10:22 PM
  #9  
97ExpGuy's Avatar
97ExpGuy
Senior User
Joined: Feb 2009
Posts: 491
Likes: 4
From: Southern Illinois
Drain the rear differential and replace the fluid along with the appropriate friction modifier - but only if it's a limited slip rear end.

If it's a standard rear end, you can try and replace the fluid and see if it helps.

Both ways, it's a somewhat costly experiment (+/- $100) to see if it works.


For the record, I have the limited slip rear end and replacing the fluid along with adding the friction modifier only somewhat helped me. I think a more effective option would be to replace with an aftermarket limited slip unit from Eaton.
 
Reply
Old Jun 3, 2012 | 10:25 PM
  #10  
Muddinexpedition's Avatar
Muddinexpedition
Thread Starter
|
New User
Joined: Jun 2012
Posts: 6
Likes: 0
How do I tell if I have a limited slip or standard diff
 
Reply
Old Jun 4, 2012 | 05:47 AM
  #11  
alwaysfords41's Avatar
alwaysfords41
Posting Guru
Joined: Feb 2008
Posts: 2,339
Likes: 0
Originally Posted by 97ExpGuy
Drain the rear differential and replace the fluid along with the appropriate friction modifier - but only if it's a limited slip rear end.

If it's a standard rear end, you can try and replace the fluid and see if it helps.

Both ways, it's a somewhat costly experiment (+/- $100) to see if it works.


For the record, I have the limited slip rear end and replacing the fluid along with adding the friction modifier only somewhat helped me. I think a more effective option would be to replace with an aftermarket limited slip unit from Eaton.
You should try doubling up on the modifier.
 
Reply
Old Jun 4, 2012 | 06:01 PM
  #12  
alwaysfords41's Avatar
alwaysfords41
Posting Guru
Joined: Feb 2008
Posts: 2,339
Likes: 0
Originally Posted by Muddinexpedition
How do I tell if I have a limited slip or standard diff
Get your axle code off the door sticker, and then google "ford axle codes" or similar and it will tell you what it is. Someone here may have the decoder handy so you could also just post it.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mowman98
1987 - 1996 F150 & Larger F-Series Trucks
6
Feb 18, 2005 11:58 PM
RobertJohn
1999 - 2016 Super Duty
6
Dec 13, 2004 01:12 PM
ladewigm
Clutch, Transmission, Differential, Axle & Transfer Case
3
Jan 30, 2003 01:35 AM




All times are GMT -5. The time now is 01:47 PM.

story-0
Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Slideshow: Ford's bizarre fishing-themed Explorer concept has resurfaced after spending decades largely forgotten.

By Verdad Gallardo | 2026-05-12 18:07:46


VIEW MORE
story-1
10 Best Ford Truck Engines We Miss the Most!

Slideshow: The 10 best Ford truck engines we miss the most.

By Joe Kucinski | 2026-05-12 13:09:47


VIEW MORE
story-2
2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Slideshow: first look at the 810 hp 2026 Shelby F-150 Off-Road!

By Brett Foote | 2026-05-12 12:50:07


VIEW MORE
story-3
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Slideshow: Everything You Need to Know about the 2027 Super Duty Carhartt Package!

By Michael S. Palmer | 2026-05-07 17:51:06


VIEW MORE
story-4
10 Most Surprising 2026 Ford Truck Features!

Slideshow: 10 most surprising Ford truck options/features in 2026.

By Joe Kucinski | 2026-05-05 11:17:22


VIEW MORE
story-5
Top 10 Ford Trucks Coming to Mecum Indy 2026

Slideshow: Here are the top 10 Fords coming to Mecum Indy 2026.

By Brett Foote | 2026-05-04 13:49:49


VIEW MORE
story-6
5 Best / 5 Worst Ford Truck Wheels of All Time

Slideshow: The 5 best and 5 worst Ford truck wheels of all time

By Joe Kucinski | 2026-04-29 16:49:01


VIEW MORE
story-7
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!

Slideshow: Ranking the 5 things owners love about their Super Duty and 5 things they don't

By Joe Kucinski | 2026-04-29 16:36:49


VIEW MORE
story-8
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!

Slideshow: Ranking all 12 Ford truck engines available in 2026.

By Michael S. Palmer | 2026-04-22 13:32:20


VIEW MORE
story-9
The Best F-150 Deal of Every Trim Level (XL through Raptor)

Slideshow: The best Ford F-150 deal for every trim level (XL through Raptor)

By Joe Kucinski | 2026-04-21 15:59:01


VIEW MORE