I usually propose which you take out the torque converter from the transmission to diagnose it adequately. The TP sensor implies the throttle plate angle. If the driving force accelerates to broad-open up throttle, the TCM disengages the TCC to downshift. All older automatic transmissions slip a tad when accelerating, https://torque-converter-clutch19741.blogtov.com/14476062/rumored-buzz-on-torque-converter-clutch