2014-2018 Chevy & GMC Silverado & Sierra 1500 5.3L Parts & Accessories

Your 2014-2018 Silverado or Sierra 5.3L V8 is a workhorse, but the factory 6-speed 6L80 transmission (and the 8-speed 8L90 in later models) is the weak link in the drivetrain. These transmissions are notorious for torque converter failures that can destroy the entire unit, as well as high operating temperatures that cook the fluid. Tier One carries the essential drivetrain upgrades you need to fix these common faults. We have everything from built transmissions and billet torque converters to thermal bypass valves and deep pans. Whether you use your 5.3L for daily driving, towing, or off-roading, Tier One has the parts to keep your transmission shifting firmly. We are your one-stop-shop for Silverado & Sierra transmission performance. If you don't see what you're looking for, contact Tier One or call 602-399-5484! If your transmission has already failed or is slipping, reliable replacements are available, so check out our 2014-2018 Silverado & Sierra 1500 5.3L Complete Transmissions. The factory torque converter is the #1 cause of 6L80 failure, so upgrade to a billet unit from our 2014-2018 Silverado & Sierra 1500 5.3L Torque Converters. These transmissions run excessively hot, so extend fluid life with our 2014-2018 Silverado & Sierra 1500 5.3L Transmission Coolers. Erratic shifting and flares can be fixed with our updated 2014-2018 Silverado & Sierra 1500 5.3L Valve Bodies. Finally, whether you need a deep pan for extra capacity or a thermal bypass valve, find it in our section of 2014-2018 Silverado & Sierra 1500 5.3L Transmission Parts.