[Ramblinrodney]

2015 GMC 2500 Duramax w/Allison

I spoke to my tuner and he had suggested to replace the stock Transmission solenoid with a new solenoid #29541895 to increase line pressure before he does transmission tuning.

Has anybody done this and opinions?

There's nothing special about this valve.
It's in every Allison from 06 six speed to present.
GM Part :29541895 PRESSURE CONTROL SOLENOID(INCLUDES 43)(PIECES 1)
Original Equipment Automatic Transmission Pressure Control Solenoids

 

[Ramblinrodney]

2015 GMC Sierra 2500 CREW CAB SLT AUTOMATIC TRANSMISSION
(009) GM Part :29541895 PRESSURE CONTROL SOLENOID(INCLUDES 43)(PIECES 1)
Original Equipment Automatic Transmission Pressure Control Solenoids

 

[Ramblinrodney]

This is one person that Mike L helped out.
"I did have Mike L at Inglewood Trans install a dummy solenoid in my trans when I did a service. That will keep extra pressure on the clutches, but it will raise the trans temp. I pulled my 7000 lb boat through the desert and the trans never passed 185* and that was in stop and go traffic, once I got on the highway it dropped to 145*"

Could ask Mike L. About his Black box.
Quote from Mike L.
"The box is installed from the outside and connects directly into the TCM"

"The black box is a pressure riser and will allow the Allison to make its maximum pressure ( 250 psi ) full time. It will hurt mileage a bit and cause the Alli to run 15/20 deg hotter temps. With good clutches, the 250 psi from the box would hold 500+ hp. The problem is the stock LML clutches will not. The LML converter is a very stout converter except for the two sided clutch which will start failing at 800 lb tq"