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Old 02-23-2019, 06:09 PM   #1
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Default Automatic 4x4 Hubs

My 1988 D21 4x4 has automatic hubs. How do these work? Are they reliable? I'm a bit concerned with reliability.

Is it possible to just swap them out with manual hubs?
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Old 02-23-2019, 07:56 PM   #2
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Auto hubs are good when they work. They need regular maintenance, clean and lube. To swap to manual hubs you just remove the 6 screws and pull out the auto hub and then install the manual ones. It can be done with the wheels on but it will be easier with them off.
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Old 02-24-2019, 04:17 PM   #3
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I had the auto hubs on mine when I bought it and they broke in short order. One of mine got to where it would try to engage while I was going down the highway at speed. It would make this absolutely horrible noise.I've had Warn manual hubs on mine for the last 5 years or so and I've been much happier with those. I hear the mile Marker ones are fine as well.
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Old 03-28-2019, 09:46 PM   #4
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I've never seen auto hubs work on these trucks. My experience is limited though maybe the harsh AZ desert sand is what makes them deteriorate fast here.


Also as a side note on my truck the instructions on how to use the auto hubs are beneath the driver side sun visor. If you give me some time I could take a pic when I'm out of work.
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Old 02-11-2020, 10:26 PM   #5
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Has anyone swapped in drive flanges and eliminated the hubs all together?
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Old 02-11-2020, 11:32 PM   #6
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Not worth the extra wear on the drivetrain.
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Old 02-11-2020, 11:35 PM   #7
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I swapped in manual hubs on my project. 6 bolts and a snap ring each side and done.
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Old 02-13-2020, 03:13 AM   #8
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The autos are junk. Never got them to work reliably. Switched over to a pair of factory manual hubs and have been happy ever since.

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Old 02-13-2020, 04:00 AM   #9
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Where did you find factory manual hubs for the V6? I was under the impression all V6 trucks had auto hubs.
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Old 02-22-2020, 07:28 PM   #10
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Junkyard. Pulled off a 4 banger.

All V6's came with autos as far as I'm aware. Autos and manuals, v6 to z24 all have same spline counts so swap directly over. There was a spline change in 90 I think, so early trucks need early hubs and visa versa. Early hubs have 27 splines while later ones have 28.

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