The Best Half Ton Towing Truck - Ike Gauntlet

ShinerBock wrote:

wilber1 wrote:

Higher RPM's mean more line pressure and less chance of slippage.

The line pressure within the clutch housing is dictated by the valve body and increases pressure within the clutch housing based on engine load/throttle input. Line pressure is one of the things I monitor on my CTS2. I can drop down a gear and be close to max rpm applying the same throttle and the line pressure to the clutches will hardly even change. In contrast, I can be at low rpm going up a hill which requires more throttle and my line pressure at the clutches will jump close to max 225 psi even though my rpm didn't change much.

I should have phrased that differently. If RPM is too low the transmission will not be able to make enough line pressure. This is always an issue with diesels that make huge torque at low rpm.