This problem has been plaguing this transmission ever since the day it was converted from a 3-speed to the four-gear style.
Don't know anything about your truck, don't know the miles and can't "feel" the shift, but if it ONLY OCCURS on the 1-2 shift and throttle position makes absolutely no difference, I'd sure be for looking at that 1-2 accumulator housing area for a hard part failure.
I posted a picture for you in your earlier post about this (an old 4L60 photo). This housing lives right behind the step motor on the right side of the truck.
Drop this housing down using a 10mm socket on the three little bolts and inspect the cushion spring (probably broken), piston and seals. Make sure the piston is not cracked and that the hole is not egg-shaped.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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