2007.5-2010 Duramax LMM 2500 & 3500 Parts & Accessories

The 6.6L Duramax LMM V8 under the hood of your 2007.5-2010 Silverado or Sierra 2500 or 3500 is hungry for more power, but the factory Allison 6-speed transmission needs support to handle it reliably. Tier One has all the Duramax LMM drivetrain upgrades you need to totally transform your truck into a towing machine or a street performance build. We carry everything from our very own built Allison 1000 transmissions and transmission rebuild kits to essential durability upgrades like high-performance torque converters, thermal bypass valves, and deep transmission pans. Be Tier One and Done with your Duramax LMM build by getting everything you need to bulletproof your drivetrain under one roof! Check out our built Allison transmissions. If you don't see something you're looking for, contact Tier One or call 602-399-5484! If your factory transmission is slipping or you are pushing serious horsepower, a stock replacement just won't cut it, so take a look at our 2007.5-2010 Duramax LMM Complete Transmissions. The factory torque converter is often the first weak point to fail when you start adding torque, so get better lock-up performance with one of our 2007.5-2010 Duramax LMM Torque Converters. The Allison 1000 runs hot due to the factory thermal valve, so keep your fluid temps in check with our 2007.5-2010 Duramax LMM Transmission Coolers. Sloppy shifts or pressure issues can be fixed with our updated 2007.5-2010 Duramax LMM Valve Bodies. Finally, whether you need a deep transmission pan for extra fluid capacity or rebuild components, we have the parts you need in our section of 2007.5-2010 Duramax LMM Transmission Parts.