A challenge, at best, but doable.
From Dr. Google.....
Converting a manual rear liftgate to a power liftgate on a 2007 Chevrolet Tahoe LTZ is technically possible but highly complex. It requires purchasing a custom aftermarket retrofit kit, routing wiring harnesses, and installing new motorized lift supports, control modules, and dashboard/hatch switches.
OEM Parts Conversion (Not Recommended)
Trying to use factory GM parts from a donor Tahoe with a power liftgate requires entirely different body wiring harnesses, the primary power lift motor, pinch sensors, control modules, and the factory latch assembly. Because of the extensive labor, custom wiring, and computer re-flashing required, converting via factory parts is widely regarded by mechanics and forum enthusiasts as cost-prohibitive and impractical.
Aftermarket Retrofit Kits (The Practical Path)
Your best option is to purchase an aftermarket
Automated Power Liftgate Retrofit Kit. These kits are engineered specifically to convert manual hatches to motorized, hands-free operation.
What a typical kit includes:
- Heavy-duty motorized lift struts (replacing your factory manual struts)
- Plug-and-play control module
- Custom wiring harness to route power from the rear to the front of the vehicle
- Dashboard and rear-hatch open/close buttons
- Hands-free foot sensor (optional upgrade on many kits)