This harness connects MSD's Atomic Transmission Controller (TCM) to specific GM automatic transmissions, providing the plug-and-play wiring needed for the swap.
Specifications:
- Make: GM
- Transmission Fitment: 4L60-85E (1993-up), 4L70E (2006-09)
- For Use With: MSD Atomic Transmission Controller (TCM)
- Warranty: Manufacturer's Limited 1-Year Warranty
- Part Number: 2770
FAQ
What transmissions does the MSD 2770 harness fit?
GM 4L60-85E transmissions from 1993-up, including the 4L70E from 2006-09.
What is this harness used for?
It connects the MSD Atomic Transmission Controller (TCU/TCM) to the specified GM transmission.
Does this harness work with Ford transmissions?
No, this harness is specific to the listed GM transmissions; MSD offers separate harnesses for Ford applications.

