Gear shift knob replacement on HGVs: what to check before ordering
Gear shift knobs on HGVs are a practical wear item in high-mileage cabs. The knob threads onto the gear lever and is often held in place by a lock ring or locking compound. After years of daily use, the internal thread wears or strips, the knob cracks, or the shift pattern legend becomes illegible.
Before ordering, confirm the gear lever thread size and ensure the shift pattern on the replacement knob matches your gearbox. On ZF and equivalent automated manual gearboxes with a gear selector rocker or dial rather than a traditional lever, the term gear shift knob does not apply in the same way.
Frequently Asked Questions
How do I remove a gear shift knob on an HGV?
Most HGV gear knobs simply unscrew anticlockwise. Some use a lock ring under the knob that must be loosened first. On a knob that has been fitted with threadlock compound, gentle heat from a heat gun applied to the knob body will usually break the compound free without damaging the lever thread.
What thread size do HGV gear lever knobs use?
Thread specifications vary by gearbox make and model. Common sizes include M10, M12, and M16. Check the existing knob thread by measuring the lever diameter or consulting the chassis parts list. Fitting a knob with the wrong thread will strip the lever or the knob at the first fitting.
Do gear shift knobs affect HGV gearbox operation?
A correctly fitted replacement knob that matches the original specification does not affect gearbox operation. A knob that is loose on the lever can transmit false vibrations to the driver's hand, making it harder to feel normal gearbox operation feedback.
Does Truckstop Group stock gear shift knobs for all HGV gearbox types?
We stock gear shift knobs for the main HGV makes and gearbox types. Call us on 01527 598 000 with the chassis number and gearbox type to confirm the correct specification.
