problem with vacume 4x4 hubs engagement - Diesel Truck Forum -
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post #1 of 3 (permalink) Old 12-15-2011, 04:49 AM Thread Starter
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problem with vacume 4x4 hubs engagement

I have a 2005 F-350 and my hubs are not engaging. I have tested the vacume lines and they are all in good shape. I have tested the solonoid and it works correctly and opportates the hubs when manually applying power to the center post and grounding one of the other post. My question is, is there a control module or a relay in this system? What makes me think there is, is the color coding on the wires from the swith to the solonoid are not the same.
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post #2 of 3 (permalink) Old 12-22-2011, 01:33 AM
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Check the fuses. Also, if you can, have someone get under the truck to listen and see if the transfer case is actuating when you turn the knob on the dash. It should go into 4H in any gear, but 4L you have to be stopped, and I believe in neutral or park.

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post #3 of 3 (permalink) Old 02-26-2012, 01:01 AM
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What I found that worked best is to,
1. Remove the factory hubs, throw them away.
2. Install Warn standard plastic hubs. (had the metal premium ones fail)
3. Enjoy!!!

Of course you will either have to keep your hubs locked in or lock them in when you need 4x4.

If I bought new I'd not get the 4x4 switch but rather the good old fashion 4x4control. All three of my trucks had vacume issues and hub failures.

00 Excursion 7.3 4x4 Limited (wifes)
99 F350 7.3 4x4 Lariat crew cab DRW
99 F250 7.3 4x4 xlt x-cab
00 BMW 328CI 2dr silver fully loaded (wifes)
69 GTO 400 4spd
65 Mustang 289 (wifes)
04 and 09 15yrd PJ dump trailers
04 H&H 20ft tilt bed trailer
98 7x14 Haulmark trailer
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