Sorry to take so long. he he he Below is his reply.

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I would first check to make sure the shift link pin on the "rooster comb" inside the pan did not somehow come disengaged from the manual valve; the valve that slides in and out of the valve body to select gears. Also you could check line pressure at the servo cover test port on the right side of the trans. You should see at least 175 psi or so at an idle in low gear with your foot on the brake pedal. A shift to second with it sitting still and idling should not change things other than a quick spike down and right back up with line pressure. Then push the transbrake button with it idling in first gear; pressure should spike down and recover immediately. If anything is funny here with the tests....let me know! Hope this helps out!