2004 AVALANCHE NOT DOWNSHIFTING. 2004 AVALANCHE HAS A DISTINCT FLAT SPOT WHEN IT SHIFTS UP, NOTICED IN EACH GEAR. WHEN IT REACHES 4TH GEAR IT WILL NOT DOWNSHIFT. EARLIER TODAY I SAW A SERVICE 4WD MESSAGE. I CLEARED THE MESSAGE AND WHEN ON MY WAY HOME. LATER I DROVE THE TRUCK AND NOTICED THIS SHIFTING ISSUE AND ATTACHED A CODE READER BUT NO CODE WAS FOUND. CAN SOMEONE HELP ME PLEASE? I CAN MANUALLY SHIFT IT BUT STILL GET THE FLAT SPOT.

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I think you are going to need a transmission rebuild to resolve this, but take it to a good shop and have them do the diagnostic work to verify my preliminary guess.
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