I found this paragraph about a change to the 2004 Allison.
A modulator valve body and external wiring harness to control the modulator were added to modulate the main oil pump pressure. This reduces oil pump pressure at engine idle speed and therefore lowers the operating noise level of the transmission and substantially increases transmission cooler flow at idle.
Although no torque rating increases were mentioned, it would make sence that if the pump pressure could be decreased at idle, it could also be increased during WOT, and help to increase the holding capacity of the clutches.
I was just wondering if you have heard anything about this change or any other changes to the Allison for 2004. Also I was planning on installing a shift kit in my Allison, and am concerned that the kit might have issues working on a 2004.
A modulator valve body and external wiring harness to control the modulator were added to modulate the main oil pump pressure. This reduces oil pump pressure at engine idle speed and therefore lowers the operating noise level of the transmission and substantially increases transmission cooler flow at idle.
Although no torque rating increases were mentioned, it would make sence that if the pump pressure could be decreased at idle, it could also be increased during WOT, and help to increase the holding capacity of the clutches.
I was just wondering if you have heard anything about this change or any other changes to the Allison for 2004. Also I was planning on installing a shift kit in my Allison, and am concerned that the kit might have issues working on a 2004.