Transmission swap

2008 CHEVROLET SILVERADO

269,000 MILES • 6.0L • V8 • 2WD • AUTOMATIC

SMASTERS37

MEMBER
1 POST

I have the truck listed above that came with a 5.3 4l60. I have since swapped for 6.0 4l80. My question is, the transmission harness compatible for the different transmission. Supposedly you buy an adapter plug which I have, and it will work. The plug adds the necessary speed sensor.

May 13, 2022 at 2:00 AM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,248 POSTS

Hi,

I'm not familiar with the adapter you have. However, I did a side-by-side comparison for both. From what I'm seeing in the wiring schematics, they look basically the same.

If you look below, the first 4 pics are for the 5.3 and the last 4 are for the 6.0. Take a look through them and use them as a reference. Note: I had to cut each page in half to make them readable for you. I did overlap each so you can follow from one to the next.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.

Images (Click to enlarge)