To determine which system you have and how to engage 4WD:
1. Check the Transfer Case Shifter: Look at the shifter on the floor console. It will likely be labeled with positions like "2H," "4H," "N," and possibly "4L."
* If you have a manual shift-on-the-fly system: This is the more common type. You'll need to be moving slowly or stopped to shift into 4H (4-wheel high). Shifting into 4L (4-wheel low) should only be done while completely stopped. The exact procedure might say to briefly press the clutch (if a manual transmission) or to briefly engage the brakes (for an automatic). Consult your owner's manual for the precise procedure as it is crucial to protect your drivetrain.
* If you have an automatic system: This system will often have a button or switch to engage 4WD. Usually, there is a dial or button on the dash to engage 4-wheel drive. This can be a push button or rotary dial system. Again, consult your owner's manual for its exact operation. These are less common in 1990 Broncos.
2. Consult your Owner's Manual: The owner's manual will provide the most accurate and detailed instructions for engaging 4WD in your specific 1990 Ford Bronco Eddie Bauer. This is crucial for avoiding drivetrain damage.
Important Considerations:
* Only engage 4WD on slippery surfaces (snow, ice, mud, etc.). Driving in 4WD on dry pavement can damage the drivetrain.
* Engage 4L only when you need extra low-speed torque, such as for rock climbing or getting unstuck. 4L significantly reduces speed and is not for normal driving.
* Shifting into 4WD at speed can cause serious damage to your vehicle.
Without knowing your specific transfer case configuration, it's impossible to give precise instructions beyond the general advice above. Your owner's manual is the definitive source of information. If you don't have one, you can often find a digital copy online through Ford's website or third-party automotive document repositories.
