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Automatic Transmission | 2020-2025 GM 6.6 Duramax L5P

Allison has been supporting the Duramax equipped GM's since their infancy stage with the release of the first 2001 model. Over the years, the Allison has naturally progressed with the added power and ... read more

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RevMax ZeroFlex Billet E Clutch Hub 20-23 GM 6.6L Duramax L5P REVM-10L1000-600 5.00 RevMax ZeroFlex Billet E Clutch Hub 20-23 GM 6.6L Duramax L5P RevMax Converters 10L1000-600 The RevMax 10L1000 Billet E Clutch hub is a patent-pending two-piece design. The splines that engage the main shaft and the clutch hub teeth are made of billet 4140HTSR Steel. The sealing surface for the shaft to hub fitment is made of billet 6061-T6 aluminum. The steel hub will not gouge like the factory aluminum will and the spline coupling will also not strip out as the factory one does PPE Performance Bar And Plate Transmission Cooler 20-25 GM 6.6L Duramax PPE-124066000 15.00 PPE Performance Bar And Plate Transmission Cooler 20-25 GM 6.6L Duramax PPE (Pacific Performance Eng.) 124066000 Keep your transmission temperatures cool with PPE's Performance Bar and Plate transmission cooler. ATS Billet Flex Plate 17-23 GM 6.6L Duramax L5P ATS-3059004440 20.00 ATS Billet Flex Plate 17-23 GM 6.6L Duramax L5P ATS Diesel Performance 305-900-4440 The ATS Billet Flexplate for 2017-2023 GM 6.6L Duramax L5P is built to handle extreme power and high performance applications. Mishimoto Heavy Duty Universal Oil Cooler With 8" Electric Fan MISH-MMOC-25-K-MAIN 7.00 Mishimoto Heavy Duty Universal Oil Cooler With 8" Electric Fan Mishimoto MMOC-25-K Keep your engine temps in check with the Mishimoto Heavy Duty Universal Oil Cooler with 8” Electric Fan, available in two options: 25-row or 23-row cooler.
Allison has been supporting the Duramax equipped GM's since their infancy stage with the release of the first 2001 model. Over the years, the Allison has naturally progressed with the added power and features that the Duramax has produced. Beginning with the 2020 model year, the L5P engine was again, upgraded, so it was evident that the transmission would need some finesse to support this newfound power. Presto, the the 10 speed Alison 10L1000 was introduced now power-holding and fuel mileage were combined into one unit. The 10 speed Allison is a work of art. This engineering marvel is something from the future. Extremely compact and lightweight for its torque capacity yet packing 10 speeds!

However, as with ALL transmissions, they have their breaking point. We have found that prevention can be one of the key successors for a long lasting transmission, which is why we highly recommend adding a quality deep sump transmission pan and Schaeffer's brand transmission fluid to your Allison, no matter how you use it. And for those that are seeking higher horsepower or have accumulated some miles and are in need of heavier duty internals, we carry upgrades ranging from ATS, BD, and AFE torque converters to full blown billet transmissions that can handle ANYTHING you want to throw at them.

As always, if you need assistance in determining the correct parts for you, give us a call or send an e-mail to [email protected] and we would be happy to help.

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