The exact procedure depends on whether it has a manual shift-on-the-fly system or a push-button system (less common in that year).
Most likely (Manual Shift-on-the-fly):
You'll find a transfer case lever, usually located on the floor, near the gear shift. It will have positions like:
* 2WD (or 2HI): Two-wheel drive, rear wheels only. This is the normal driving position.
* 4HI (or 4H): Four-wheel high range. Use this for snow, ice, mud, or other low-traction situations. Engage this only at low speeds (under 20 mph) and on loose surfaces. Driving in 4HI on dry pavement can damage the drivetrain.
* N (Neutral): Neutral position for the transfer case.
* 4LO (or 4L): Four-wheel low range. Use this for extremely low traction, steep inclines, or winching. Engage this ONLY at a complete stop.
To shift into 4HI:
1. Come to a complete stop. This is crucial.
2. Move the transfer case lever to the 4HI position. You might need to overcome some resistance.
To shift into 4LO:
1. Come to a complete stop. This is absolutely crucial.
2. Move the transfer case lever to the 4LO position. This will usually require more force than shifting to 4HI.
If it has a push-button system:
If it has a push button system, it will likely have buttons labelled 4HI and 4LO. The procedure is largely the same: you need to be at a complete stop. Consult your owner's manual for the exact procedure, as there might be additional requirements like a speed limit below which to engage 4WD.
Important Considerations:
* Owner's Manual: The most accurate information will be in your 1995 Chevy Suburban's owner's manual. Consult it for detailed instructions and safety warnings.
* Speed: Never engage or disengage 4WD while the vehicle is moving, except for some very specific systems (and the '95 Suburban likely doesn't have one of those).
* Road Surface: Only use 4WD when necessary. Driving in 4WD on dry pavement can cause damage to the drivetrain.
* Terrain: Understand the difference between 4HI and 4LO. 4LO is for very low speeds and extreme off-road situations.
If you're unsure about any of this, consult a qualified mechanic. Improper use of the 4WD system can cause serious damage to your vehicle.
