Compression Ignition Addict
Join Date: Aug 2007
Location: New Martinsville, West Virginia
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The auto hubs work on vacuum. If there is a problem with the hub, it may make noise, it may lose vacuum and not lock in by it'self, thus you need to manuely lock them in. If you replace the hub with a quality Warn or other brand (not the stock Auto hub) you lose the auto, but gain reliablity. Only you have to get out and lock in the hubs like the rest of us...
The noise could be from the lock out hub, the unit berring (wheel berring) or the axle universal joint... There is also a needle berring inside the unit berring that the axle stub shaft (short section from the universal joint to the lock out hub) rides in, when the needle berrings go out it makes a lot of noise. Had this happen 2 or 3 times, unit berring is good, but the needle berring goes out. All part of the warrenteed part, so the whole unit has gotten replaced on both sides in the past year...
'99 E350 DRW Stahl 11' util box van, 7.3 PSD, stock. 138k SOLD
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E'99 F250 extcab, S/Bed 211k. Sidelined due to motor issues.
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'84 Chevy K-30, 6.2L TD, woods/trail beater. 141k