transmissions with issues non PT related

[MarkB]

With your tach showing 200 RPM higher then normal, would point towards your converter slipping. Even though you feel it unlock when you tap the brake, doesn't mean that it is fully locking up. If you put the truck on a snap on scanner you can watch TCC slip %, it should be 0 or a negitive when fully locked up, it can allow up to a 240 RPM slip when going up an incline before setting a code, but if you are seeing a positive number while the converter is locked up on flat ground then your converter is slipping. This is very common on these trucks. Many updates have been made on the converter and the lock-up piston due to this issue.