1. Stock Tire Size: The size of the tires that came with your truck from the factory.
2. Wheel Offset: The distance between the mounting surface of the wheel and the center of the wheel.
3. Suspension Type: Whether your truck has a solid front axle or an independent front suspension.
4. Fender Clearance: The amount of space between the tires and the fenders.
In general, if you are staying within 1-2 inches of the stock tire size, you should not need a lift. However, if you are going beyond that, or if you have concerns about fender clearance, it is recommended to consult with a professional or use a tire size calculator to determine the optimal fitment for your truck.
Additionally, it's important to consider other factors such as potential impact on the vehicle's performance, fuel efficiency, and handling characteristics when making changes to tire size.