help me understand Shift on fly
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Junior User
Joined: May 2002
Posts: 74
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From: Somerville USA
help me understand Shift on fly
OK- something is wrong and i am hoping it's not going to cost me a lot.
I have a 2001 F250 4x4. It seems like the 4 wheel drive is not engaging now.
The truck has 54,000 miles on it. The hubs are in AUTO mode and when I select 4-HI- I hear a soft sound (not the usual loud thump) and I am getting no power to front wheels. I tried to move the hubs manually to LOCK but I cannot budge them. What could be the cause and how much is this going to run me?? I don't have the time right now to work on this myself. (I am not confident I can fix it)
I have a 2001 F250 4x4. It seems like the 4 wheel drive is not engaging now.
The truck has 54,000 miles on it. The hubs are in AUTO mode and when I select 4-HI- I hear a soft sound (not the usual loud thump) and I am getting no power to front wheels. I tried to move the hubs manually to LOCK but I cannot budge them. What could be the cause and how much is this going to run me?? I don't have the time right now to work on this myself. (I am not confident I can fix it)
Post Fiend
Joined: Feb 2007
Posts: 5,078
Likes: 0
From: Rural WV
Are you the original owner? Is this a truck you just bought? Have you read what the manual says about the shift on the fly?
I know that when I try to engage mine and I'm outside of the stated parameters, I worried that I was gonna tear something up....that was done for me on one of my old Rangers (thanks, oldest son!) so I'm damn careful in the King Ranch.
I know that when I try to engage mine and I'm outside of the stated parameters, I worried that I was gonna tear something up....that was done for me on one of my old Rangers (thanks, oldest son!) so I'm damn careful in the King Ranch.
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
The automatic 4 wheel drive system (ESOF) used by Ford Super Duty trucks has 2 weaknesses.
The first (and worse in my opinion) is the automatic hubs. They are junk. You should replace them with a good quality aftermarket MANUAL hub. It isn't a very hard job, instructions with great pictures for this modification are available in the tech folder.
The second is the motor system that acutally engages the 4H or 4L. Seems that these fail on a regular basis. Replacements are avaailable at most parts stores and I hear on ebay.
The first (and worse in my opinion) is the automatic hubs. They are junk. You should replace them with a good quality aftermarket MANUAL hub. It isn't a very hard job, instructions with great pictures for this modification are available in the tech folder.
The second is the motor system that acutally engages the 4H or 4L. Seems that these fail on a regular basis. Replacements are avaailable at most parts stores and I hear on ebay.
Post Fiend
Joined: Jun 2003
Posts: 5,643
Likes: 8
From: NE Texas
Engage the system frequently. Make sure the hubs lock by manually getting out and seeing if you can turn the axles. When you disengage the system, get out and make sure the hubs release by twisting the axles. Sometimes the truck has to move a little before the hubs disengage, but not far.
Check the vacuum hoses for leaks.
Usually the ESOF system hardly ever "clunks" really loud anyway.
Check the vacuum hoses for leaks.
Usually the ESOF system hardly ever "clunks" really loud anyway.
