A50 to T87 TCM Upgrade Module

Features:

• Fits 2011-2014 Silverado and Sierra 6.6L Duramax
• Replaces failing A40 and A50 TCM modules
• Upgrades to faster 2023-style T87a TCM
• Improves shift quality and responsiveness
• Plug and play install with no cutting required
• Supports stock and modified truck setups
• Includes pre-installed custom ATS calibration
• Built-in Co-Pilot increases transmission durability
• Increases line pressure for better clutch holding
• Helps prevent common TCM failure issues
• Comes with harness, mount, and Translator module
• Direct replacement for multiple AC Delco TCMs

Bring Your Duramax Back To Life With Better Shifts

If your 2011-2014 Duramax is sidelined because of a failed TCM, you’re not alone, and this ATS A50 to T87 TCM Upgrade Module is the fix you’ve been waiting for. The original A40 and A50 modules are known weak spots, and once they fail, you're stuck with limited options, until now. ATS took the same powerful T87a TCM found in newer 2023 trucks and made it fully compatible with your older Duramax, giving you better shift quality, faster response, and improved drivability all in one upgrade. This isn’t just a patch, it’s a serious performance improvement with plug-and-play simplicity. No cutting, no custom tuning, just a factory-style harness, a mounting bracket, and a proven fix you can install in the driveway. Whether your truck is bone stock or tuned for higher output, this setup is ready to handle it. Get back on the road with stronger shifts and confidence that your transmission is in good hands.

Faster Processing And Co Pilot Control In One Package

The ATS 601-940-4368 A50 to T87 TCM Upgrade Module is a complete drop-in solution designed for 2011-2014 GM 2500HD and 3500HD trucks with the 6.6L Duramax. This kit replaces your outdated and failure-prone A40 or A50 TCM with the faster, more reliable T87a module used in modern Duramax applications. Pre-installed with a custom ATS calibration, this module improves shift timing, increases line pressure, and enhances overall drivability across both stock and modified trucks. Also included is ATS’s Translator module featuring built-in Co-Pilot technology, which enables smarter pressure control and better clutch engagement under load. That added control translates into longer transmission life, especially for trucks that tow or run higher horsepower. The system installs easily using the included OEM-style harness and bracket with no permanent modifications. It also serves as a direct replacement for several AC Delco TCM part numbers, making it a smart and future-proof upgrade for Allison-equipped Duramax owners.

Fitment: 2011, 2012, 2013, 2014 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• Fits 2011-2014 Silverado and Sierra 2500HD/3500HD with 6.6L Duramax
• Replaces discontinued A40 and A50 TCM modules
• Upgrades to a faster, more reliable T87a TCM
• Includes pre-installed custom ATS calibration
• Improves shift speed, timing, and drivability
• Includes Translator module with Co-Pilot pressure control
• Enhances line pressure for better clutch holding
• Compatible with both stock and modified trucks
• Direct replacement for AC Delco TCMs: 24256861, 25978353, 15117030
• OEM-quality plug-and-play harness and mounting bracket included
• No permanent modifications or tuning required for installation
• Developed as a long-term solution to common TCM failures