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Four wheel drive will not engage?

Tiny
ADAMSLHO
  • MEMBER
  • 1 POST
  • 1999 FORD F-150
4WD does not engage. Switch does not "light up" showing 4WD option (hi-low) or make "clicking" sound.
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Monday, April 12th, 2021 AT 10:56 AM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok here is a diagram of the vacuum that locks the front diff. I would like you to check to see that all the vacuum lines are not cracked and connected good and tight. Check the 4x4 relay and check fuse number 23. IN the under hood battery relay fuse box check fuse 104. Let me know what you find and we will go from there.


https://www.2carpros.com/forum/automotive_pictures/249564_Graphic_12.jpg

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Monday, April 12th, 2021 AT 10:56 AM (Merged)
Tiny
MRDANT
  • MEMBER
  • 2 POSTS
  • 1999 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 98,000 MILES
I had a problem with the windows not working intermittently and the wipers as well. The 4x4 light was light was on and it was not in 4x4. The 4x4 did not work, The odometer would work intermittently as well. I replaced the GEM module now the 4x4 is engaged all the time, the 4x4 light is not on. The odometer is still intermittent but everything else is working fine. The GEM module I purchased is for a 1999 thru 2003 f 150 with button 4x4. My truck is also a button control 4x4 or switch if you prefer.
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Monday, April 12th, 2021 AT 10:57 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check to see if your motor for 4x4 on tcase is stuck check fuse 104 uderhood and shift relay module in center of dash it may have bad relay or the module is bad also check 4wd relay in rpo relay box.
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Monday, April 12th, 2021 AT 10:57 AM (Merged)
Tiny
MRDANT
  • MEMBER
  • 2 POSTS
I checked the fuses it was bad all fixed thank you.
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Monday, April 12th, 2021 AT 10:57 AM (Merged)
Tiny
JASONBAKER369
  • MEMBER
  • 4 POSTS
  • 1999 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 191,000 MILES
I was driving down the road no previous problems with the transmission it was even doing great all day. Turned on an exit and rpm shot up and I had no reverse and no forwards just grinds when I put back in park. What happened? And this is the third transmission been put in this truck.
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The fact that it grinds leads me to believe it is not the transmission.

Good chance it is either the transfer case or the differential.

https://www.2carpros.com/articles/automatic-transmission-problems

Were there any noises before this happened?

Roy
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
JASONBAKER369
  • MEMBER
  • 4 POSTS
No it was running great I've not had any issues I just turned on a exit and the rpm's shot up.
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
JASONBAKER369
  • MEMBER
  • 4 POSTS
But I put it in reverse or drive 2 or 1 and nothing put it back in park and it grinds.
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It does not sound like the transfer case. Check it to be sure.

Roy
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
JASONBAKER369
  • MEMBER
  • 4 POSTS
Okay, pulled transfer case back and the out put shaft is spinning just not through transfer case. I will get one. Thank you very much! I've never had a transfer case fail just during normal driving. Thank you again I will get it installed this afternoon I hope.
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
RAY25444
  • MEMBER
  • 1 POST
  • 1999 FORD F-150
I took this to a mechanic because the electonic 4 wheel drive shift button seems to be working. It lights up and makes the same sounds it always did, but it doesn't engage into 4 wheel drive high or low. The rear tires just spin. They called and said the vacuum hoses were melted? Can you tell me what could have caused this. I don't drive this truck very much or use the 4 wheel drive very much. Any ideas?
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Monday, April 12th, 2021 AT 10:58 AM (Merged)
Tiny
CHRISK
  • MEMBER
  • 5 POSTS
I had a similar problem with my '98. Replaced a bunch of stuff - turns out the problem was a sticky valve on the transfer case (controlled by vacuum). So now every now and then I spray it with WD-40 and it's good to go.
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Monday, April 12th, 2021 AT 10:59 AM (Merged)
Tiny
GARYWYDENES
  • MEMBER
  • 1 POST
  • 1998 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 260,000 MILES
Need to know if there is a vacum line or sothing simple as to why 4x4 does not ingage
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Monday, April 12th, 2021 AT 11:00 AM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Yes there is to the front diff. There is also a motor on the back of the transfer case. Here is the vacuum diagram of the vacuum system for the front axle engagement. Hope this helps and have a great day. Your donation keeps us going.


https://www.2carpros.com/forum/automotive_pictures/249564_Graphic_12.jpg

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Monday, April 12th, 2021 AT 11:00 AM (Merged)

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