What does preload mean in the rear axle?

Preload in the rear axle refers to the initial tension or compression applied to the suspension components, such as springs or shocks, before any load is applied. This adjustment affects the ride height, handling characteristics, and responsiveness of the vehicle. Proper preload ensures optimal performance by maintaining the correct alignment and allowing for effective suspension travel during driving conditions. Too much or too little preload can lead to uneven tire wear and compromised vehicle stability.