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Q:

at 55mph speed sounds like transmission is slipping. only at that speed. on 2002 GMC Sierra 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
before or after that point of 55mph, its fine runs great.
(1) Answer
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poss lock up issue, seek a free diag from aamco then shop prices
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