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That makes sense. It does feel like the pressure has been increased. So the PCM will do this when it detects slippage? It only does it once code is set. Apparently the increased pressure isn't enough to reduce slippage or engage the TCC. What would cause it to go into failsafe? The truck is...

Brad, yes, it does seem to go into a failsafe mode. The only reason I think it is is because the truck will begin to shift hard once the code is set.

Imp, well if that is the case, then it must warm up very quickly because as soon as I take the truck to 45 - 50 mph, the OD light will begin to flash. Meaning the code is set and the TC was given the command to lockup. Doesn't matter if the truck was sitting over night.

Ok so I have been chasing this issue on a friend of mines 2004 sport trac. It has the OD light flashing and I was able to get a local shop to scan if for me. It is the P0741 code. So far I've changed trans fluid and the TCC solenoid with no luck. I have test drove this truck and the light will...