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?
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.
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.)
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.
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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.
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.
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