* Transmission: The type of transmission (Allison or other) significantly impacts line pressure. Allison transmissions are known for their sophisticated hydraulic control systems with pressure dynamically adjusted based on conditions.
* Operating Conditions: Line pressure will change based on throttle position, engine speed, gear selected, and load. It's higher under heavier loads and during acceleration.
* Specific Component: Are you asking about the pressure in the transmission lines, the power steering lines, or the brake lines? Each system has its own pressure range.
To find the appropriate pressure, you'll need to specify *which* system you're interested in and consult the appropriate service manual for your specific truck. The manual will provide specifications and diagnostic procedures. You can often find these manuals online through sites selling repair manuals or potentially via a subscription to a service manual database. Keep in mind that attempting to measure line pressure without the proper tools and knowledge can be dangerous.
