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 > 4x4 front hub

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valhalla360

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Posted: 12/07/21 03:38am Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

valhalla360 wrote:

cummins2014 wrote:


I could manually lock my hubs on my 99 Superduty ,and they were also auto .


That's how I recall on the 2001 I had. Problem was unless you manually operated them regularly, they would get harder and harder to turn. I made a habit of ever month or so moving them a few times. Even then it took a tool (stuffing box wrench from the boat) to turn them.



This should not have been the case. Did you ever take them apart to see why? Generally it's because someone slathered the locking hub mechanism full of grease. The guts of the locker should essentially be dry. Recommendations vary from dry to a spray of light lube to a very small, judicious amount of grease.

Unless they leak water in and get corroded, that is. For example, I have a 1974 Jeep, that until last year, the front lockers/bearings etc hadn't been apart for at least the 15 years I owned it and likely not for a quarter century or more. They still operated like butter.
I probably engaged them every year or 3, depending if I took it wheeling or not.

Same with the 1986 GMC we have. I still need to open up the front hubs and check/pack bearings, but by the looks of everything, these haven't been apart in a very long time either. And they work easily.
Even back in the day, in the rust belt, a hard to turn or stuck locking hub mechanism was rare on the fleet I took care of.

This is inclusive of several 4wd Superduty company trucks I had over the years as well. Especially given I never really turned the hubs because they are auto.


I don't claim to be an expert but I looked it up at the time and it was a common issue. Crud gets built up around the o-ring that seals them and makes them harder and harder to turn.

I didn't use 4x4 and I could get it to operate (with hassle), so never felt the need to tear it apart.

Was the 1974 Jeep the same style as the 2001 Ford? I thought back then they were manual only. One recommended solution was to swap them out for simple manual hubs (you do lose the 4x4 on the fly option of course unless you leave the hubs locked).


Tammy & Mike
Ford F250 V10
2021 Gray Wolf
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Full Time spliting time between boat and RV


Grit dog

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Posted: 12/07/21 09:17am Link  |  Quote  |  Print  |  Notify Moderator

^No, manual hubs only on older vehicles like I mentioned. Although the locking hubs work on the same principle and also have gaskets or o-rings to seal them.


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4x4ord

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Posted: 12/07/21 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:

4x4ord wrote:

Anyone know what the torque multiplication of the 10r140's torque converter is and/or if the 2020+ Super Duty still uses a transfer case with a 2.72:1 gear reduction in low range?


If you floor it and the wheels don't slip, you could twist the axle right off the hub (or something else might fail first).

Used in moderation, there is little risk using 2-Low to maneuver a trailer. In Low range, you are unlikely to ever need to do more than a slight goose of the throttle.



I've pulled a heavy tandem dually gooseneck with its tires sunk down into the ground and used 4 low. I was quite surprised how much throttle it took before the truck started slipping on firm dry ground. The good news is that both front and rear axles slipped without breaking anything.... the driveline doesn't necessarily need to be able to handle all the engine can dish out so long as it can handle all the traction the tires provide.


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valhalla360

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Posted: 12/07/21 10:58pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

^No, manual hubs only on older vehicles like I mentioned. Although the locking hubs work on the same principle and also have gaskets or o-rings to seal them.


Yes, switching to manual hubs was a suggestion as it eliminates the need to seal the unit for the pneumatic actuation.

4x4ord

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Posted: 12/09/21 09:44am Link  |  Quote  |  Print  |  Notify Moderator

In case anyone is interested I ran the truck at 3300 rpm in 5th gear in both 2 low and 2 high. According to the digital speedometer the truck went 39.0 km/hr in low and 103.4 km/hr in high. According to that the low range reduction on the 2021 Super Duty is 2.65:1.... I believe the 2013 Super Duty had a 2.72:1 reduction so more than likely my test is a little off and the current Super Duty still has 2.72:1 gear reduction in low.

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