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Is it a 722.3? If so ATSG says for "upshifts in upper speed range of gears only"
1) Bowden cable
2) Check regulator pressure - if the pressure is too low change the governor
3) Make control pressure regulating valve operable.
This is all on page 103 of the ATSG manual. Have you got a copy?
EDIT - warning - see ps2cho about the governor.
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