20-23 LT to 25-25 Silverado LTZ front end swap

James818 · January 11

Hey everyone, seeing a lot of nice write ups on this conversion but just looking for a little additional advice on this as I’m almost done piecing it together.

I have a 2021 Silverado 2500 Z71 midnight with factory LED. I have the 2025 headlights, headlight harness from Gen5, Facia and LTZ grille
My new oem bumper came with a pre installed harness for sensors / fogs etc, does anyone know it this main bumper harness plug mates with the existing 20-23 harness?
Also are there any issues with the active grille shutter frame? Some write ups I read say to install an upper shutter frame from a 24-25, and some say you don’t?
Any input appreciated.

Edited January 11 by James818

carkhz316 · January 13

I'm not positive about the bumper harness as I kept my older bumper setup while updating the grille and headlights. The active grille shutters are nearly the same, but have different attachment points for the grille. You don't NEED the newer frame, but if you reuse your older one, a few of the grille clips won't have anything to attach to. It'll still work though.

Edited January 13 by carkhz316