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won't shift in next gear

I understand this transmission upshifts automatically. This one suddenly stays in low and does not shift. Any thoughts.
  • Posted 17 Nov 2010 01:27
  • By snowman
  • joined 14 Sep'08 - 27 messages
  • Ontario, Canada
Raising service to a new level.
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We had an issue with a GP45K. There was a small High /Low relay under the Left Side floor board ontop of the wire harness. Rain water had caused it to fail. Just a thought.
  • Posted 17 Nov 2010 02:38
  • By Prentice
  • joined 25 Jun'08 - 600 messages
  • Ontario, Canada
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