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In 'D' the trans' should upshift at WOT before hitting the rpm limit.
The ONLY time the limit should cut in is if you select other positions ie : 1/2/S/N...etc. and possibly R !!!!! Although personally I've never tried to run backwards in 'R' to find out.....someone here, no doubt has !
Either the trans is faulty or adjustment has been upset...check with last tech you saw, and ask him/they to check operation of trans' shift points.
Seem to think that factory rpm limit on your engine is higher than 5500.rpm.( ?)
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