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Torque converter locking and unlocking?
For some time now my 4r100 transmission has been acting weird. If I'm driving around in overdrive at highway speeds and give my truck a decent amount of gas the torque converter seems to unlock and lock several times. It'll build up the revs a couple hundred RPMs for 1 second and then drop back to where it was...then it'll do it 5-6 times and then not to it for the duration of my drive.
If I shut my truck off, turn it on, it'll do it all over again. But once it stops doing it, it'll be fine for regardless of how many miles I drive. Otherwise, the transmission is fine. I towed a 12k lb trailer 75MPH the other day and everything was fine.
I recently got a DP-tuner chip but the the transmission had always been a little weird even before the DP-tuner chip.
2000 F250 7.3L Powerstroke -4x4
Mile Marker selectable hubs
4" stainless exhaust with 3.5 down pipe
Truetrac limited slip in the rear
Boss 8'2" Poly VXT Plow
DP-Tuner F5 - Stock, 80hp Econo, 100hp performance, 60hp tow