4X4 No Worky - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 01-13-2007, 04:05 AM Thread Starter
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Red face 4X4 No Worky

I was just wondering if anyone else has had this problem? Put the switch into 4X4 high and low and the light comes on but no 4X4. No sounds coming from the front end like there is any mechanical failure. Just nothing. I haven't tried turning the hubs manually do to I foregot about that the night we found out there was problem and too it is my brothers truck. He is coming over this weekend to see if we can try to find the problem and get it fixed before on of us has to have it. I was told tonight by someone that it could be that the vaccum lines are needing to be replaced that it is a common problem. Just looking for advice before I waste a whole day on this project.

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post #2 of 17 (permalink) Old 01-13-2007, 04:55 AM
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sounds like you have a vacumn leak or the pump has gone to a better place.

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post #3 of 17 (permalink) Old 01-13-2007, 05:44 PM
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The leak is usually on the lines that go from the frame to the hub. it could also be a seal inside the hub. if you can lock the hubs in manually and make it work i would first unhook the vaccuume lines at the hubs to see if their is any vaccuume there, and then start traceing back.

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post #4 of 17 (permalink) Old 01-13-2007, 10:10 PM
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Are you sure the transfer case is going into 4x4?? I'd start there and work up to the hubs. The transfer motor may not be working or getting power to engauge.

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post #5 of 17 (permalink) Old 01-14-2007, 02:29 AM Thread Starter
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What if I can't lock the hub, then what? (manually)

09 F250 Crew Cab FX4
5% tint 35% whole windshield w/5% brow
4" lift
35X12.50R20 Toyo
Under cab Lights
Bed Lights
5" Flow Pro No Muffin W/6" tip
Spartan 310
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post #6 of 17 (permalink) Old 01-14-2007, 03:54 AM
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Time to rip it appart. Depending on mileage, you might want to take a good look at the wheel bearrings too. Mine crapped out at 85K. Check the vaccume lines, and the yellow o ring in the hub. You should replace the o ring, it's a dealer item but only about 3 bucks. The hubs do freeze up , the best way to prevent this is to lock it in every so often durring the non peak useage months to keep them working.

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post #7 of 17 (permalink) Old 01-14-2007, 02:07 PM Thread Starter
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How do you unfreeze the hubs without breaking anything?

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4" lift
35X12.50R20 Toyo
Under cab Lights
Bed Lights
5" Flow Pro No Muffin W/6" tip
Spartan 310
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post #8 of 17 (permalink) Old 01-14-2007, 02:58 PM
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You will have to take it all apart and check to see what is sticking. It may be salvageable, or need replaced depending on what is fubared.

'00 cc f 350 a few mods, and a bts tranny.

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post #9 of 17 (permalink) Old 01-14-2007, 03:46 PM
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Remember if you offroad Alot its wise to tear them down pretty often and check them along with Re=Greasing the Front Bearings. I couldnt tell yah how to do it on a SD. But it was an almost weekly routine on my Jeep during the Mudd Season.

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post #10 of 17 (permalink) Old 01-14-2007, 03:59 PM
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Ya can't tear apart a SD wheel bearring. Fords wisdom thought a sealed unit was better. It's a replace the unit job, costly but less mess.

'00 cc f 350 a few mods, and a bts tranny.

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