Is this towing or unloaded. cause when im towing heavy, either way the tow mode is set, sometimes i have to ease off the throttle for it to shift gears. this is a nice tranny, but really does need some tweaking.I know mine will hold a gear a little longer as it goes up through the gears when accelerating with tow/haul on. I don't know if it does it at lower throttle inputs. I usually notice it more when I am on the throttle more.
Mine just holds the gear longer when I'm in tow/haul mode, no matter if I'm loaded or not. Usually it seems like it shifts around 2500 rpm, but it runs up to around 3000 rpm when in tow/haul. Either way, I only see about 30 psi max. I know if you manually shift, it will let you get up to about 3500 rpm before it starts dropping you down for hitting redline.Is this towing or unloaded. cause when im towing heavy, either way the tow mode is set, sometimes i have to ease off the throttle for it to shift gears. this is a nice tranny, but really does need some tweaking.
Good job doing the research. I know when i first bought my trucks they tsb my tranny with a flash for low line pressure. What we need is a dang proggy that will do it. Doesnt sound like a hard program to make.I did some digging in the service manual and found that the TCC is contolled by the L/R solenoid, and the solenoid is controlled by the PCM. The PCM grounds the DG/WT wire from the transmission solenoid assembely connector to lock the TCC according to the wiring diagram. I also found that the solenoid has multiple duty cycles to partially lock the TCC for a few seconds before it fully locks. This is the slipping we notice. I'm not sure if grounding that wire with a toggle switch would fully lock the TCC right away or not. I also found that the PCM controls line pressure from the signal from the line pressure sensor. The voltage supply to the sensor is 5 volts, the signal to the pcm has to be between .35 and 4.75 v to not throw any codes. I wonder if we could put a diode in the cuircit to raise the line pressure a little. Some one tell me how to put a picture on here and I will post some wiring diagrams.