A while back, I ended up blowing the transmission pump. Since the car has over 200K on it, we decided to rebuild the transmission. Everything went fine until the test drive. It would not upshift. We found that by quickly 'bumping' it into neutral and back into drive, it would upshift. Funny thing is that when you slow up and it downshifts, as long as you do not stop, it will then upshift.
We have had numerous people look at this and are at a loss. Any help would be greatful !!

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100