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Possible slipping transmission on 1998 GMC Safari

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
When going up a long hill the trans constantly shifts between 3rd and 4th at approx 60mph. Speedometer bounces between 50 and 70 with no noticeable change in vehicle speed.
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