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Auto Locking Hubs explanation

129147 Views 24 Replies 14 Participants Last post by  97_7.3_4X4
Ok Ive gone through a lot of threads here and cannot find an answer to my question.

I have a 2001 F250 7.3 Diesel. I just replaced both auto locking hubs and wheel bearings. All tested fine and according to my mechanic, all is working normally. I want to know if 4WD low engagement is the same as getting out of your truck and locking the hubs manually. If I have my hubs in the "auto" position, why do I still have to get out and rotate the hubs into manual. Some people are telling me that because of limited slip differential that I dont have full 4WD until I get out and change the hubs to manual. So my question is why have auto locking hubs if I still have to manually change the hubs.

It seems like I have half 4WD until I lock the hubs myself. Then its great. I've gotten stuck in snow many times thinking I have engaged 4WD when I haven't.
Its frustrating when everyone with 4WD is just plowing past you.

Thx anyone

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The vacuum system can take up to one full revolution of the tire to engage the hub. So if you get stuck in two wheel drive, then engage the vacuum 4 wheel drive switch, the hub may not be able to engage. So you would then have to get out and manually lock in the hubs.
Which way?

I have a question.
I have never had to use my manual locks until last weekend (I have owned the truck only a year and a half). My last truck (Dodge) did not have manual hubs.
The problem is there are no markings on the hubs to indicate which way to turn them. I turned them both to the right to engage and both to the left to disengage. Does that sound right?
They were very hard to turn. Do they need some type of maintenance? I imagine there is some crud in there that needs cleaning out?
I know this is a rookie question, but it's my first Ford 4X.:icon_ford:
Thanks for the link. That is just what I needed.
I like the way the vacuum system works and would like to keep it working.
I did not realize the Warns were manual only.
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