3 files changed, 6 insertions, 3 deletions
diff --git a/keyboards/keebio/sinc/rev3/config.h b/keyboards/keebio/sinc/rev3/config.h
index 89c8c0f3d8..3771f8da1d 100644
--- a/keyboards/keebio/sinc/rev3/config.h
+++ b/keyboards/keebio/sinc/rev3/config.h
@@ -16,8 +16,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#define SPLIT_HAND_PIN GP4
-
 #define SERIAL_USART_FULL_DUPLEX
 #define SERIAL_USART_TX_PIN GP0
 #define SERIAL_USART_RX_PIN GP1
diff --git a/keyboards/keebio/sinc/rev3/keyboard.json b/keyboards/keebio/sinc/rev3/keyboard.json
index da828dbb35..9ee599dd20 100644
--- a/keyboards/keebio/sinc/rev3/keyboard.json
+++ b/keyboards/keebio/sinc/rev3/keyboard.json
@@ -20,12 +20,18 @@
                 ]
             }
         },
+        "handedness": {
+            "pin": "GP4"
+        },
         "matrix_pins": {
             "right": {
                 "cols": ["GP29", "GP28", "GP27", "GP7", "GP2", "GP3", "GP11", "GP12", "GP13"],
                 "rows": ["GP16", "GP19", "GP17", "GP9", "GP8", "GP26"]
             }
         },
+        "serial": {
+            "driver": "vendor"
+        },
         "transport": {
             "sync": {
                 "matrix_state": true
diff --git a/keyboards/keebio/sinc/rev3/rules.mk b/keyboards/keebio/sinc/rev3/rules.mk
deleted file mode 100644
index 161ec22b16..0000000000
--- a/keyboards/keebio/sinc/rev3/rules.mk
+++ /dev/null
@@ -1 +0,0 @@
-SERIAL_DRIVER = vendor