DrMikeG2
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gm tsb 18-na-355 transmission flush
DrMikeG2 replied to cstmg8's topic in 2014-2018 Silverado 1500 & Sierra 1500
It's a regular flush/fill but they need to use the more expensive synthetic HP Trans fluid. We brought ours in 2 days ago and they were going to replace it with the same factory fluid. Using this fluid (photo) eliminated our shudder.
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