A50 to T87 TCM Upgrade Module

Features:

• Replaces outdated A50 and A40 TCMs
• Faster shifting with T87a processor
• Improves shift quality and drivability
• Pre-installed custom ATS transmission tuning
• Supports higher power and torque levels
• Plug-and-play installation, no tuning required
• Includes ATS Translator® and Co-Pilot tech
• Enhances line pressure for better clutch hold
• Prevents TCM failure from OEM design flaws
• OEM-quality harness and mounting bracket
• Compatible with stock or modified trucks
• Restores functionality to unsupported transmissions

Take Control Of Your Allison Like Never Before

If your 2015 Silverado or Sierra HD is still relying on the factory A50 TCM, it's only a matter of time before it lets you down. These original modules are prone to internal failure, often leaving Duramax owners stranded with limited options. That’s where the ATS A50 to T87 TCM Upgrade Module steps in. Built around the newer and more powerful T87a platform found in current Duramax trucks, this upgrade completely transforms your driving experience. Shifts become noticeably faster and smoother, drivability improves across the board, and your Allison finally responds the way it should under load or acceleration. Best of all, it installs using a plug-and-play harness with no permanent modifications needed, so you can get back on the road quickly. ATS even pre-loads their custom tuning into the TCM, giving you better performance right out of the box. Whether you're towing, hauling, or just daily driving, this upgrade brings confidence and consistency back to your transmission.

Built With The Technology To Handle More Power

This kit doesn’t just replace your outdated TCM, it completely reengineers the way your Allison 6-speed behaves. At the heart of the system is ATS's Translator® module, which communicates seamlessly between your truck's electronics and the new T87a TCM. That T87a unit is unlocked and loaded with a custom ATS calibration, specifically tuned to improve clutch engagement, shifting response, and transmission longevity. Also included is ATS’s Co-Pilot functionality, which actively manages line pressure to help the transmission hold more power without slipping. This is especially important for trucks that are tuned or regularly used for towing and heavy work. The kit includes a mounting bracket and high-quality wiring harness for straightforward installation. And with full support for both stock and modified setups, this upgrade is a smart, future-proof solution for any 2015 6.6L Duramax owner still running the vulnerable A50 system.

Fitment: 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Notes:

• The A50 and A40 TCMs are no longer supported by GM or Allison as of 2022
• Over 10,000 Duramax trucks were affected by discontinued A50/A40 support
• This upgrade is designed specifically for 2015 GM Silverado and Sierra 2500HD/3500HD with the 6.6L Duramax engine
• The T87a TCM used in this kit is found in newer model Duramax trucks and offers significantly better performance
• Factory A50 and A40 TCMs commonly fail due to internal wire shorting
• This kit includes both a new unlocked T87a TCM and ATS Translator® module
• Custom ATS calibration is pre-installed to improve shift quality and power handling
• Plug-and-play installation with no need for permanent modifications
• Works with both stock and modified transmissions and trucks
• Includes mounting bracket and complete wiring harness for easy installation
• Not just a replacement, this is a full upgrade in performance and reliability