4 wheel drive

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steven1 - 12 Jun 2006 01:53 GMT

i have a 1998 f-250. my 4-wheel drive will not engage. the shifter will be in
the correct position and the 4-wheel indicator will come on. is there
something electrical or vacume opperated that inables it to engage?

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djdave - 12 Jun 2006 03:33 GMT

I have a 98 (11/97) F250 Super Duty.
There is no vac. control on it. Do you have the original Lock-Out hubs
on the front axle or automatic hubs?
If unfamiliar with the truck, you may need to "Lock" your "Lockout
Hubs"

My way to check 4x4 operation is to get all 4 tires off the ground,
have someone in the truck engage 4x4 with brakes on, then release.
Make sure they reapply brakes, and speedometer is at zero before
shifting to neutral or park.

>i have a 1998 f-250. my 4-wheel drive will not engage. the shifter will be in
>the correct position and the 4-wheel indicator will come on. is there
>something electrical or vacume opperated that inables it to engage?

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Matt Macchiarolo - 12 Jun 2006 05:54 GMT

The electric shift on the fly system (switch on dash, not lever on floor)
has vacuum operated automatic hubs that are very trouble prone. The manual
system has manual hubs that must be dialed in.

>I have a 98 (11/97) F250 Super Duty.
> There is no vac. control on it. Do you have the original Lock-Out hubs
[quoted text clipped - 11 lines]
>>the correct position and the 4-wheel indicator will come on. is there
>>something electrical or vacume opperated that inables it to engage?

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djdave - 13 Jun 2006 05:24 GMT

I stand corrected. I was 100% sure that vacuum shift on the fly was
NOT available on any F250 in 1997/1998.

I do remember something of a electronic shift on the fly.

>The electric shift on the fly system (switch on dash, not lever on floor)
>has vacuum operated automatic hubs that are very trouble prone. The manual
[quoted text clipped - 15 lines]
>>>the correct position and the 4-wheel indicator will come on. is there
>>>something electrical or vacume opperated that inables it to engage?

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Matt Macchiarolo - 14 Jun 2006 01:02 GMT

That's for the Superduty, I can't speak to earlier. The Superduty auto hubs
can be dialed manually to "lock: as well, but a '98's is probably seized up
good.

>I stand corrected. I was 100% sure that vacuum shift on the fly was
> NOT available on any F250 in 1997/1998.
[quoted text clipped - 21 lines]
>>>>the correct position and the 4-wheel indicator will come on. is there
>>>>something electrical or vacume opperated that inables it to engage?

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Jeff Strickland - 12 Jun 2006 05:46 GMT

Why do you feel the 4WD is not engaged?

Also, do you have manual hubs that require you to get out and turn a dial on
the front axle to lock the hubs in? (I do not think this is standard fitment
on your truck, but it is an option that a previous owner might have put on.)

>i have a 1998 f-250. my 4-wheel drive will not engage. the shifter will be
>in
> the correct position and the 4-wheel indicator will come on. is there
> something electrical or vacume opperated that inables it to engage?

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