When driving a new truck with a manual transmission downhill, what gear should you use?

Using a lower gear than you would use to climb the hill is the appropriate choice when driving a new truck with a manual transmission downhill. This practice is crucial because lower gears provide stronger engine braking, which helps to control the vehicle's speed and prevents it from gaining excessive momentum while descending.

When the truck is in a lower gear, the engine helps to slow the vehicle down, reducing the reliance on the brakes and minimizing the risk of brake overheating, which can lead to brake failure. This method not only enhances safety but also protects the braking system during prolonged descents.

In contrast, selecting a higher gear would not provide adequate engine braking, potentially leading to a loss of control as the truck speeds up downhill. Using the same gear as when climbing may not be effective for descent, as it may not offer the necessary resistance to maintain a safe speed. Being in any gear might mislead drivers to use inappropriate gear selection that could compromise control and safety.