Another 4wd Thread - Ford Powerstroke Diesel Forum
 
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post #1 of 4 Old 05-07-2014, 07:03 PM Thread Starter
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Another 4wd Thread

I did some searching and can't seem to find the answer. I'm having a problem with my 4wd not engaging. When I turn the ESOF knob I can hear the t-case solenoid switch and get a 4wd light on the dash. I get no output to the front axle though and manually turning the hubs does the same thing. This has been a problem a few times where I have a 4wd light and hubs manually locked but can't get any power to the ground and had to work the truck hard to get unstuck a few times. The last time, suddenly I heard a pop/bang and then got power to the front axle.

Just replaced the unit bearing and o-rings and while doing that I replaced the bottom vacuum line to the unit bearing. Today I replaced the vacuum pump with a reman unit from Oreillys. The hubs were disassembled and greased about 9 months ago and were working (sort of) before the unit bearing replacement.

When you engage the ESOF switch and get a light, is that a verification that the t-case is in fact engaging power to the front drive shaft? Or can I be getting a good connection but the shift motor isn't really doing anything? Could it be the relays or something else entirely?

'03 F250 Lariat CC/SB FX4, 4R110 from FoMoCo, 6637 intake, AIH delete, aFe 4" straight, TS 6-pos, 38r on a blank pedestal, Iron Cross wheel-to-wheel steps, Recon smoked cab & 3rd brake light.
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post #2 of 4 Old 05-08-2014, 11:43 AM Thread Starter
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Bump.

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'03 F250 Lariat CC/SB FX4, 4R110 from FoMoCo, 6637 intake, AIH delete, aFe 4" straight, TS 6-pos, 38r on a blank pedestal, Iron Cross wheel-to-wheel steps, Recon smoked cab & 3rd brake light.
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post #3 of 4 Old 05-09-2014, 07:13 PM
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You have any vacuum leaks does your A/C controls work?

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post #4 of 4 Old 05-10-2014, 02:55 AM Thread Starter
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I had at least one which is why I replaced the vacuum pump. Was raining yesterday so I didn't have time to troubleshoot any more leaks. I did inspect my hoses when I redid my ball joints and bearings.

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'03 F250 Lariat CC/SB FX4, 4R110 from FoMoCo, 6637 intake, AIH delete, aFe 4" straight, TS 6-pos, 38r on a blank pedestal, Iron Cross wheel-to-wheel steps, Recon smoked cab & 3rd brake light.
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