Peterbilt 387 Dash Knobs

Frequently Asked Questions About Peterbilt 387 Dash Knobs

What are Peterbilt 387 dash knobs used for?

Dash knobs are the control knobs used to operate functions such as headlights, panel lights, heater and air conditioning controls, wiper settings, and other dashboard switches inside the Peterbilt 387. They replace worn, cracked, or missing knobs so the controls in your cab look and function properly.

Will these knobs fit my Peterbilt 387 exactly?

Most dash knobs are designed to match the factory shaft size, shape, and thread pattern used on the Peterbilt 387, but knob styles can vary depending on the model year and which control it operates. It is a good idea to compare the shaft size and mounting style of your old knob to the product listing, or check the fitment notes provided, before ordering to make sure you get the correct match.

What materials and finishes are these knobs available in?

Dash knobs are commonly offered in materials like durable plastic or metal, with finish options such as chrome, black, or brushed metal. Some knobs include printed or engraved labels or symbols to identify the function they control, so you can choose a finish that matches your existing interior or upgrade the look of your dash.

How do I install a new dash knob?

Installation is typically straightforward and does not require special tools. Most knobs simply pull or twist off the existing shaft, and the new knob is pressed or twisted into place until it is secure. Some knobs may be held on with a small set screw or clip, so it is worth checking the design of your specific knob before removing the old one.

Why does my dash knob feel loose or spin without controlling anything?

A loose or spinning knob is usually a sign that the knob itself has worn out, cracked internally, or the mounting point on the shaft has stripped. In most cases, replacing the knob resolves the issue, but if the problem continues after installing a new one, the underlying switch or control shaft may need to be inspected as well.