Clutch Fan Info

The issue with going HD or server duty is the lock up speed is so low (especially on a stock or lower HP engine) that the engine looses it ability to slip the fan for those - “drop it in 1st and rocket” moments. At that point you may as well just use a bolt on stock fan. HD were made for trucks with a “low pull rpm” need like pulling a heavy trailer up a steep hill. The truck is under heavy load, getting hot as heck and not moving very fast at all to allow air to go thru the radiator. Way different than a light car jumping from stop light to stop light. If you’re already moving air thru the radiator… you do not even need a fan.
Syleng1