f250 4x4 shift on the fly not working properly

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hotwrench1973 - 08 Feb 2006 14:09 GMT

I am having troubles with getting my shift on the fly to work properly.
It will work if i manually shift it, but it will not on auto. when i
shift in in auto, the front shaft moves, but the front hubs do not
engage. I have power to the solinoid, and there is some vaccum, but i
am not sure what the specs are for vaccum and voltage. Can someone
help me on this.
thanks

steve

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hotwrench1973 - 08 Feb 2006 15:51 GMT

I have just recently noticed that on this shift on the fly prob.,
when the hubs are in auto possition and the switch is engaged into 4x4,
the front axles are turning, but the wheels are not. does it still
need to have vaccum inorder for the wheels to engage?

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Matt Macchiarolo - 08 Feb 2006 19:41 GMT

Might help to give us the year of your truck. Assuming it's a 98+ Superduty,
the auto hubs are notorious for going south. If you lock them manually you
will have 4wd. I have a similar problem with my '02, but my hub dials are
seized and I can't get them out of auto, meaning when the auto lock finally
dies I won't have 4wd at all. Will be replacing the hubs locks with Warn
manual locks soon.

>I have just recently noticed that on this shift on the fly prob.,
> when the hubs are in auto possition and the switch is engaged into 4x4,
> the front axles are turning, but the wheels are not. does it still
> need to have vaccum inorder for the wheels to engage?

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The OTHER Kevin in San Diego - 10 Feb 2006 04:06 GMT

>Might help to give us the year of your truck. Assuming it's a 98+ Superduty,
>the auto hubs are notorious for going south. If you lock them manually you
>will have 4wd. I have a similar problem with my '02, but my hub dials are
>seized and I can't get them out of auto, meaning when the auto lock finally
>dies I won't have 4wd at all. Will be replacing the hubs locks with Warn
>manual locks soon.

Precisely why I opted for full manual - hubs and xfer case - on mine.

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351CJ - 10 Feb 2006 04:51 GMT

>>Might help to give us the year of your truck. Assuming it's a 98+
>>Superduty,
[quoted text clipped - 6 lines]
>
> Precisely why I opted for full manual - hubs and xfer case - on mine.

Me too.

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Matt Macchiarolo - 10 Feb 2006 13:36 GMT

Agreed, I swore I would never get an elec shift on the fly again but the new
excursion doesn't have an available lever on the floor.
:-(

>>Might help to give us the year of your truck. Assuming it's a 98+
>>Superduty,
[quoted text clipped - 6 lines]
>
> Precisely why I opted for full manual - hubs and xfer case - on mine.

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hotwrench1973 - 11 Feb 2006 01:05 GMT

well....I have finally found the problem with this truck. I appoligize
for not telling you what year it was...it was a 2000. I found that the
right hub was not holding vaccum. Which is due to the seals. This was
a new thing to me. I learned something on the fords vaccum front
hubs...thanks for the input.

> Agreed, I swore I would never get an elec shift on the fly again but the new
> excursion doesn't have an available lever on the floor.
[quoted text clipped - 10 lines]
> >
> > Precisely why I opted for full manual - hubs and xfer case - on mine.

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