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sticking in gear

  1. 01-04.5 LB7 Duramax Powertrain
    My 2003 is doing funny things. About a month ago it started having a hard time changing up gears when at full throttle. It seems to keep getting worse, cuz this week it started doing it @ 3/4 throttle, i've tried it in tow haul mode and it still does it, i changed the atf along with internal...