Notices
1999 - 2016 Super Duty 1999 to 2016 Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
Sponsored by:
Sponsored by: Real Truck

shift on the fly problem

Thread Tools
 
Search this Thread
 
Old Sep 16, 2009 | 08:34 PM
  #1  
scott alvarez's Avatar
scott alvarez
Thread Starter
|
New User
Joined: Sep 2009
Posts: 14
Likes: 0
shift on the fly problem

Please i hope someone has had the same problem and knows how to fix it. My four wheel drive will not work with shift on the fly I have changed everything the switch on the dash the vac switch under the hood the relay switches the electric motor on the trasfercase. i can manually engage the hubs and they lock in i have even taken the electric motor off the transfer case tested it and it works fine. I took a wrench manually turned the shift *** on the trasfercase and the four wheel drive will work but electriclly it will not work. please help
 
Reply
Old Sep 16, 2009 | 10:03 PM
  #2  
scott alvarez's Avatar
scott alvarez
Thread Starter
|
New User
Joined: Sep 2009
Posts: 14
Likes: 0
Fixed the problem

It was after all the relay switches that it seems no one knows about under the hood. they are located on the drivers side in between the master cylinder and the fender there are two black boxes. the one closer two the master cylinder has two relay switches in there one makes the motor electric motor that switches the transfer case from two wheel drive to four high and then to four low. the other makes it go back from four low to four high then back to two wheel drive. So if someone has a problem with there transfer case not changing this is the problem it has nothing to do with the hubs thou. my vac to the hubs don't work but i can manually engage the hubs this is all i care about screw the electric shift ****. give me back the good old days of manual everything. everyone has got to lazy to get out and lock it in. If you can't get out to lock it in you don't need a 4X4.
 
Reply
Old Sep 16, 2009 | 10:09 PM
  #3  
scott alvarez's Avatar
scott alvarez
Thread Starter
|
New User
Joined: Sep 2009
Posts: 14
Likes: 0
Originally Posted by scott alvarez
It was after all the relay switches that it seems no one knows about under the hood. they are located on the drivers side in between the master cylinder and the fender there are two black boxes. the one closer two the master cylinder has two relay switches in there one makes the motor electric motor that switches the transfer case from two wheel drive to four high and then to four low. the other makes it go back from four low to four high then back to two wheel drive. So if someone has a problem with there transfer case not changing this is the problem it has nothing to do with the hubs thou. my vac to the hubs don't work but i can manually engage the hubs this is all i care about screw the electric shift ****. give me back the good old days of manual everything. everyone has got to lazy to get out and lock it in. If you can't get out to lock it in you don't need a 4X4.
OH BY THE WAY THE FORD DEALER DID NOT EVEN KNOW THERE WAS RELAY'S THAT WORKED THE FOUR WHEEL DRIVE SHIFT ON THE FLY. BUT THIS SHADE TREE MECHANIC FOUND THEM.
 
Reply
Old Sep 16, 2009 | 11:31 PM
  #4  
EXv10's Avatar
EXv10
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Actually a lot of people know about them if you would do a search on it in here.
 
Reply
Old Sep 16, 2009 | 11:52 PM
  #5  
scott alvarez's Avatar
scott alvarez
Thread Starter
|
New User
Joined: Sep 2009
Posts: 14
Likes: 0
Originally Posted by EXv10
Actually a lot of people know about them if you would do a search on it in here.
LOL i have been everywhere for two weeks since i bought this truck and i have not found it. I knew there had to be a relay and went to ford and asked the part guy for a relay for the shift on the fly and he said there was none. but i know enough to know there had to be one some where. I found them by messing with my friends F250 while he was putting in and out of four wheel drive listening for a click while the engine was off. i herd it under the hood and found them on his truck. But i am amazed that they are not listed in the manual under relays. i am more amazed that the parts guy at ford did not find them in there parts. But thanks anyway. I am glad to have four wheel working now i can put my boat in on the beach again.
 
Reply
Old Sep 17, 2009 | 03:40 PM
  #6  
EXv10's Avatar
EXv10
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
You can switch them around in the future to detect a bad one.
 
Reply
Old Sep 17, 2009 | 05:32 PM
  #7  
Bone683's Avatar
Bone683
New User
Joined: Apr 2003
Posts: 21
Likes: 0
From: Alaska
Well I am having some what of the same problem. 4X4 won't engage. The 4x4 light comes on, on the dash, tried the relays can still hear the shift motor engaging. Any other ideas?
becides tearing into the transfer case
 
Reply
Old Sep 17, 2009 | 08:58 PM
  #8  
EXv10's Avatar
EXv10
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Are you sure it's not your vacuum? Do a search.
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-1

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-2

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-3

Every 2026 Ford Engine Explained

 Brett Foote
story-4

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-5

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-6

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-7

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-8

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
story-9

Top 10 Ford Truck Tragedies

 Joe Kucinski
Old Sep 17, 2009 | 10:32 PM
  #9  
Bone683's Avatar
Bone683
New User
Joined: Apr 2003
Posts: 21
Likes: 0
From: Alaska
yes, i believe it to be the vacuum. Changed out the vacuum switch that is on the fender. still didn't solve the problem.
The passenger side line has vacuum at the hub but the drivers does not
 
Reply
Old Sep 17, 2009 | 10:43 PM
  #10  
EXv10's Avatar
EXv10
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
They both need vacuum and you should take the hubs apart and clean/grease them & check the seals before you do any more.
 
Reply
Old Sep 18, 2009 | 09:20 PM
  #11  
Bone683's Avatar
Bone683
New User
Joined: Apr 2003
Posts: 21
Likes: 0
From: Alaska
i still don't have vacuum to the drivers side traced the line couldn't find anything. Even without the vacuum the hub shoudl still engage in the lock position correct ? Took it to a shop and they said the hubs were bad but i don't think they checked for anything vacuum related
 
Reply
Old Sep 18, 2009 | 10:14 PM
  #12  
EXv10's Avatar
EXv10
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
It's already engages in the lock position but it would still go through the motions. There should be vac lines comining out of the top of both knuckles near the ABS lines if you have that.
 
Reply
Old Sep 19, 2009 | 01:20 AM
  #13  
Bone683's Avatar
Bone683
New User
Joined: Apr 2003
Posts: 21
Likes: 0
From: Alaska
yeah i have checked the vac lines the drivers side has nothing still trying to figure out the leak very hard to find.
the hubs should engage if the hub are locked in, and the 4x4 turned on correct ?
sorry i am just wondering if i don't have a bad hub and a vacuum leak. but i hope not
 
Reply
Old Sep 19, 2009 | 01:29 AM
  #14  
EXv10's Avatar
EXv10
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
You don't need to lock the hubs if you have vacuum powered (ESOF) system.
 
Reply
Old Sep 19, 2009 | 02:34 PM
  #15  
Bone683's Avatar
Bone683
New User
Joined: Apr 2003
Posts: 21
Likes: 0
From: Alaska
Just wondering if I could still should be able to get use of the 4x4.
 
Reply



All times are GMT -5. The time now is 01:04 AM.

story-0
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-1
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-2
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-3
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-4
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-5
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-6
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-7
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-8
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE
story-9
Top 10 Ford Truck Tragedies

Slideshow: Top 10 Ford truck tragedies.

By Joe Kucinski | 2026-05-18 19:34:33


VIEW MORE