ATS TCM Upgrade, A50 To T87 4-Wheel Drive For 2011-2014 GM 6.6L Duramax 2023-2025 GMC Sierra 3500 Use soapy water throughout the

Use soapy water throughout the air lines to check for leaks

If you plan to source your own stabilizer for 2005-2016 model trucks you will use a stabilizer for a 2017 or newer truck

This kit has been specifically designed for the 1200GS

a rubber air spring inserted into a car factory's coil spring

ATS TCM Upgrade, A50 To T87 4-Wheel Drive For 2011-2014 GM 6.6L Duramax 2023-2025 GMC Sierra 3500 Use soapy water throughout theThe A50 and T14 TCM that is used to control the Allison 6 speed automatic transmission is the weak link of the Allison transmission. This is due to delicate thin wires inside the TCM that contact one another overtime and short out the entire module. In 2022, Allison sent out a letter (SIL 15 1K2K 22) announcing the discontinuation of support for the A50 and T14 TCMs. This effectively left over 10,000 Duramax owners out of their trucks. Some of the