The CDF is essentially Step 2 of the recommended TSB procedure. The valve body overhaul is Step 1 (after checking for codes).
37K. It’s all going to be covered by the drivetrain warranty.
I hear ya.
the sad part is, if they find valve body problems and stop there because its fixed, you're still not out of the woods if you have an impending CDF drum failure.
Im not taking mine in until that damn drum is hanging out the bottom with fluid all over the ground , so, never most likely , I don't put enough miles on it to get it to exploded enough to get a new transmission , so I'll just live here in transmission purgatory until i level up ... or down...
I'd love to know what the expected line pressure target is. They mention they saw it was low and that the Valve Body was the issue. That should be easy to verify through forscan or the tuner for the rest of us.
I dug some and all I can find is that, for a Line Pressure Test, you tap into the transmission with a pressure gauge. Bi-Directional command the Line Pressure Up and Down.
And whether the converter is being commanded to lock or not. The pressure table would be all over the map. Far cry from a 4L60 with its relatively 'simple' pressure control. That's probably why there's nothing in the service manual for it other than the delta between commanded and measured. They probably have pressure ramping up during shifts and then backing back of or some other such control. I also think that the pressure control is PWM, so there's another point of fluctuation.
Thanks for looking this up, it's at least a useful place to start. It sounds like if I can find the LINEDSD PID in forscan I can evaluate the condition by comparing actual pressure to commanded pressure.I dug some and all I can find is that, for a Line Pressure Test, you tap into the transmission with a pressure gauge. Bi-Directional command the Line Pressure Up and Down.
No more than 10-PSI variance allowed between commanded and actual line pressure.
Now Ford - PID charts do not show this specific data that I can find, but I do remember seeing transmission specific data the last time I had my Autel scanner hooked up.
I might have to hook up and see, but I am sure the pressure is going to vary, depending on Gear and Speed.
EDIT:
I do not know if this is accurate, but I did find this.
and this note:
Using a diagnostic scan tool, monitor and compare the PID LINEDSD# to actual measured pressure. Actual measured pressure should be within 10 PSI (69 kPa) of PID LINEDSD#. Raise engine RPM to 2000 RPM and verify LPC operation by monitoring LINE pressure while commanding LINEDSD# up and down.
LineDSD = Line Pressure Desired
IMHO, the valve body is just a stop gap fix so they do not have to replace the whole transmission or rebuild the whole thing when the CDF clutch drum fails. I think they hope the valve body will mask issues long enough for the transmission to last until the owner trades or the truck goes out of warranty.
