1. Come to a complete stop. Never attempt to shift out of 4-Low while moving.
2. Shift the transfer case shifter (the one that selects 2WD, 4-High, and 4-Low) to Neutral (N). This is usually done with the vehicle stopped and the engine running. (Some early models may not have a separate neutral position).
3. Slowly start driving, and attempt to shift back into 2WD. If the truck does not shift easily then there may be a problem. The shift should feel smooth and not require force.
If it won't shift:
* Check your speed. You might need to be moving very slowly and only a few miles per hour to engage 2wd. Try again.
* Try rocking the truck slightly back and forth. Sometimes a slight rocking movement helps disengage the gear.
* Check your vacuum lines (if applicable). The 1998 F-150's 4WD system may be vacuum-controlled, and a leak in a line can cause issues. Examine the vacuum lines for damage or loose connections.
* Inspect for obstructions. Check around the transfer case for any signs of obstructions that might be preventing the shift.
* Have it professionally checked. If you've tried the above and still can't get it out of 4-Low, take it to a mechanic specializing in trucks. Forcing it could cause serious and costly damage. There may be an internal mechanical issue within the transfer case.
Important Considerations:
* Never try to force the shift. This is crucial. Forcing it can easily strip gears or cause other damage to the transfer case.
* Driving in 4-Low on dry pavement is very damaging. Only use 4-Low when you need serious traction in mud, snow, or other low-traction conditions.
If the truck isn't shifting into 2WD, it almost certainly indicates a mechanical problem, not something that will be corrected by simply turning a button or lever. A professional diagnosis is recommended to avoid expensive repairs.
