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Has anyone here ever heard of the EPC valve on the valve body of the 4L60E transmission? Did you know this simple valve has a torx bit screw on the end that will allow you to turn up the tranny pressure without harming anything electronic? I work in a transmission shop and learned a few things about the valve body and such and learned that when you take off the pan, look towards the back of the transmission on the passenger side with the tranny in the vehicle and you will see a large solenoid. This is the EPC valve. To raise line pressure without hurting any electronics, remove the 1-2 shift accumulator (this little accumulator has a trick of its own) and then take off the electric connector and you will see the torx head screw. To raise line-pressure turn this screw clock-wise 3/4 of a turn to gain roughly 15 psi line pressure which brings normal drive line pressure from 55 to 65-70 psi. Ive done this to my vehicle here recently and it has done wonders for me. I only turned mine up about 1/2 a turn and it firmed up my shifts incredibly to the point where I can feel every shift the car makes from 1-OD without feeling it downshift. On wet roads just this simple mod has made my vehicle able to break tires loose shifting from 1-2. I recommend this to someone looking for firmer shifts but doesnt want to worry about electronics problems.
Now for the accumulators. As most of you know, ost shift kits come with new springs for the accumulators. All these accumulators do is act as a resisting force in series with the clutch that the fluid has to push on while it applies the clutch. The trick I learned in the shop is if you want neck breaking shifts (possibly part breaking shifts) take these accumulators out and simply turn them upside down with the spring on the backside instead of underneath them. This allows the tranny fluid to go straight to the clutches without having to go through anything to get there first making it the most direct path for fluid to flow.
Do any of these mods at your own risk!!!
Just thought id share a few tricks of the trade I picked up working at a tranny shop.
Now for the accumulators. As most of you know, ost shift kits come with new springs for the accumulators. All these accumulators do is act as a resisting force in series with the clutch that the fluid has to push on while it applies the clutch. The trick I learned in the shop is if you want neck breaking shifts (possibly part breaking shifts) take these accumulators out and simply turn them upside down with the spring on the backside instead of underneath them. This allows the tranny fluid to go straight to the clutches without having to go through anything to get there first making it the most direct path for fluid to flow.
Do any of these mods at your own risk!!!
Just thought id share a few tricks of the trade I picked up working at a tranny shop.
