GPI – GM T87A TCM Unlock Service for Transmission Tuning

GM T87A TCM Upgrade Service by Gwatney Performance

Enhance your GM vehicle’s transmission performance with Gwatney Performance T87A TCM Upgrade Service. This specialized upgrade is designed for 2015–2020 GM vehicles equipped with 6-speed, 8-speed, or 10-speed transmissions utilizing the T87A TCM. By upgrading your TCM, you unlock full access to transmission tuning parameters using HP Tuners’ VCM Suite (BETA), allowing precise control over shift behavior, torque management, and more—directly via the OBDII port.

• Upgrade Only Service: Send in your existing T87A TCM to be upgraded for HP Tuners compatibility—no programming or VIN changes included.
• Broad Compatibility: Supports a wide range of GM vehicles including Silverado, Sierra, Corvette, Camaro, Tahoe, Suburban, and more (2015–2020).
• Transmission Types Supported: Compatible with 6-speed, 8-speed, and 10-speed GM transmissions.
• Unlock Advanced Tuning: Gain access to shift scheduling, shift pressures, torque management, and shift timing in VCM Suite.
• Quick Turnaround: 1-3 business day service time once your TCM is received (shipping time not included).
• No Relearns Required: Reinstall your upgraded TCM without needing IMMO Relearn, Crank Relearn, or “Replace TCM” functions.
• One-Time Upgrade: Permanent modification that maintains compatibility with both factory tools and HP Tuners software.
• Tuning Requirements: Requires 4 Universal Credits and a compatible HP Tuners interface (MPVI, MPVI2, MPVI2+, or MPVI3).
• Shipping Address: Gwatney Performance (ATT: GM T87A TCM Service), 200 Municipal Dr, Jacksonville, AR 72076.

Vehicle Application

• 3rd Gen CTS-V
• 6th Gen Camaro
• C7 Corvette
• GM Trucks (2014-2019)
• GM Trucks (2019-2024)