I monitored mode 6 looking for any sign of misfires and saw nothing when the faults occur (or ever). The PCM has run and passed all monitors except EVAP. I have monitored the range sensor and other data and cannot see any anomalies that coincide with the faults. I have scoped the turbine sensor, intermediate sensor, output sensor and never saw any glitches or drop outs. That suggests to me there must be an input problem. Now looking at scan data it appears to me that when the erratic shifts happen, they are being commanded. They have never returned even though I have duplicated the problem numerous times. I recorded the data and cleared the codes. It stored codes P0761 Shift solenoid "C" performance and P2702 Friction element "C" apply time performance. Early on in my driving and testing the truck acted up very badly for a stretch and the wrench light came on. The Trans shop said they never saw any fault codes stored. I keep accelerating more and more and finally it will skip 3rd and slam into 5th. Also, when the problems start it will often times hang way to long in 2nd gear. Sometimes it will throw a downshift for seemingly no reason, then it may throw an unintended upshift or go down up down or up down up etc.
The symptom is, after driving for several miles, the transmission will start to shift erratically. I will post what I have tested so far and hope that some one can give me some direction on what to test next. I have never done any diagnoses on one of these before now, so it's a learning curve. This has the 5R110W torqshift transmission. After spending a lot of time on this I see now why they pushed it off on me. Got this beauty from a local Transmission shop I'm friends with to diagnose a Transmission fault.
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