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HOW TO: Diagnose your 4x4 system. ESOF

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Old 12-31-2016, 12:01 AM   #311
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Unless I missed it, my problem wasn't covered. First of all thank you for the write up I understand this system much better now.
I now know I need to replace my IWE Solenoid, as I have the old one and shifting into 4hi the light comes on and goes out right away but it still engages.

My biggest problem is when I engage in 4wd I get a loud whine from the front end but it is only under acceleration. As soon as I take my foot off the throttle it goes away. I was thinking it was caused by worn gears in the front diff or a worn pinion bearing or carrier bearings, but after reading this I am wondering if the actuators are only partially engaging. As soon as I have time I will try your diagnostic instructions, but just wondering if you think the actuators are the most likely culprit here?

Thank you
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Old 12-31-2016, 01:34 AM   #312
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I would start with the IWEs and Hubs. Do the tests and hope that's it, because those are much less expensive to repair than the front diff or transfer case.
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Old 01-07-2017, 11:10 AM   #313
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I would start with the IWEs and Hubs. Do the tests and hope that's it, because those are much less expensive to repair than the front diff or transfer case.
Thank you, I did your tests and figured it out. The passenger side actuator was completely seized and corroded and basically crumbling away. With your tests I found my wheels would not unlock and traced the lack of vacuum all the way to where the vacuum line comes out of the intake manifold, it was completely gummed and plugged with water and rust. For the record that line is a giant pain to put back on. I did not hook it back up to the solenoid as I knew there was no point, obviously that is where the water entered the system, so I jumped the two lines together to finish testing. Found that I had vacuum on the pass side, but not the drivers side, but when I plugged the line on the pass side the driver side would get vacuum, so determined the leak to be on the pass side which is where I found the destroyed actuator. I would have been lost without your tutorial so thank you much for that.

On a side note I also gave a shake to my yoke and I have about a 1/2 inch of movement in the drive axle and the whole diff itself so I am next to drop that out for new pinion bearings, carrier bearings, and hopefully nothing else. Lesson learned if you hear a noise in 4wd don't put it in 2wd assuming it disengages and won't do further damage and put off the repair. Now that I understand the vacuum system I realize why that was a bad choice.
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Old 07-21-2017, 11:24 PM   #314
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Thanks VTX, turns out i had to R&R my TCM
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Old 08-28-2017, 08:08 PM   #315
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Default 2005 44 front driveshaft turning in 2wd

I'm brand new to this so bear with me. I have a 2005 44 and noticed that the front driveshaft is turning while in 2wd. Sometimes it takes a while to lock in 4 high and 4 low. What would cause the driveshaft to turn while in 2wd?
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Old 08-29-2017, 11:33 PM   #316
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I'm brand new to this so bear with me. I have a 2005 44 and noticed that the front driveshaft is turning while in 2wd. Sometimes it takes a while to lock in 4 high and 4 low. What would cause the driveshaft to turn while in 2wd?
It may be that your IWEs are not unlocking. You need to do the tests at the beginning of the thread.
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Old 09-11-2017, 05:05 PM   #317
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