Most people assume that lifting a truck will void the manufacturer’s warranty. However, neither lift should cancel your service contract. There are some restrictions, though. For example, automakers usually prohibit lifts over three inches. Parts you replace no longer have coverage either. So, while a suspension lift will not automatically void your warranty, it will limit your protection to just the factory parts that remain. While lifting your truck will not necessarily negate the contract, many companies deny claims if you off-road in your vehicle or use it for other unintended purposes.  Whether you choose to raise the body or suspension, many people lift their vehicle to the contract limit while the warranty is in effect. After it expires, they install a taller lift.