2000 Silverado 2500 4L80-E shift problems

Question:

. . ======= ======= I am having shifting issues with my recently purchased used 2000 2500 Silverado 4L80-E tranny. 94000 miles It up/down shifts hard from gear to gear, it is intermittent, it is usually when warm, no check engine light ever. It is sometimes a very severe harsh shift, and sometimes it shifts fine. I just did this stuff yesterday to the tranny below…. Changed filter with a new GM tranny filter. Changed 6 quarts of fluid, fluid and pan were pretty clean, I suspect previous owner did powerflush recently. Changed the Pressure Control Solenoid in the bottom of the valve body, cleaned out the passages in the PCS area, tightened up the valve body-which was tight. Reassembled, and tested. I only drove it a few miles since all that yesterday but still felt some shifting issues. Any help here, can this be programmed or need software updates to the PCM????? HELP !!!!!

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