i'm far from an expert on auto trannys, but we had a similar problem with an olds station wagon. thing just wouldn't shift under a heavy load, be-it WOT or heavy load on a hill, whatever. had the trans rebuilt and never had another problem. i know that tranny was very different from ur's, but it's a thought. good luck.
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>2008 Corvette - Borla catback/K&N
>2004 Jeep Grand Cherokee Limited 4.7L HO 4x4 black/grey
>1985 Honda Sabre V65 1100 - jetted/K&N
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