MSD 2774 Atomic Transmission Controller Wiring Harness Ford 4R100 1998-Up

The MSD 2774 is a dedicated transmission controller wiring harness engineered to connect the MSD Atomic Transmission Control Module (TCM, PN 2760) to the Ford 4R100 four-speed automatic overdrive transmission (1998 and up). This application-specific harness ensures a clean, correct-fit electrical interface between the Atomic TCU and the 4R100, eliminating the guesswork and improvised wiring that often comes with transmission controller installations.

Once connected, the Atomic TCM system allows full electronic control over the 4R100's operating parameters, including shift points, torque converter clutch behavior, and shift firmness. The system supports both auto-shift and manual shift modes and includes a dyno mode for repeatable chassis dyno testing. All adjustments are made via a handheld monitor — no PC or complicated software required.

Key Features:

• Direct-fit wiring harness for Ford 4R100 transmissions, 1998 and newer
• Designed specifically for use with the MSD Atomic Transmission Control Module (TCM PN 2760 or 2761)
• Enables full control of shift points, shift firmness, and torque converter clutch behavior
• Supports auto-shift and manual shift modes
• Compatible with stand-alone Atomic TCM (PN 2760) and Brainwave/Atomic EFI-integrated TCM (PN 2761)
• Emissions Code 5 — legal for use on emissions-controlled, non-emissions-controlled, and racing-use vehicles
• Includes Proposition 65 warning

The MSD 2774 harness is a required companion piece to the Atomic TCM for 4R100-equipped Ford applications. The Atomic TCM itself (sold separately) also provides real-time monitoring of engine speed, vehicle speed, throttle position, transmission fluid temperature, shifter position, and commanded gear via the handheld monitor. OEM Part Number cross-reference: UPC 085132027743.