Is it electronically controled or does it go off of throttle position by wire? If it is electronically controlled, I'd check for a 'power' button that might be depressed, that delays shifting to get 'more' power out of the gear. If it is controlled by wire, I would check the wire to see if it is getting caught up on something and not allowing it to go back fully and allow the transmission to shift.

Richard

Had an 89 Isuzu Pickup
Had a 94 Mitsubishi Eclipse
84 Honda XL185S
Had an 89 Isuzu Trooper w/ 3.4 V6
01 Toyota Tundra SR5 V8 4Door Access Cab
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