| Rank | Board name and description | Posts | Members |
| 1 | LS2 General Motors discussion board | 12013870 | 24400 |
| 2 | LS1 Tech Chevrolet and GM enthousiasts discussion | 11117800 | 158498 |
| 3 | Full Size Chevy GM SUVs and trucks forums | 4018889 | 114080 |
| 4 | GM Full Size General Motors trucks community | 3448442 | 23023 |
| 5 | Colorado K5 Chevrolet and GM trucks message boards | 2576956 | 53345 |
| 6 | GM Inside News Chevrolet, Pontica, Cadillac and other GM brands forums | 1823688 | 47192 |
| 7 | J-Body GM enthusiasts forums | 835400 | 17292 |
| 8 | Trailvoy Chevrolet Trailblazer forum | 828251 | 53128 |
| 9 | The Diesel Garage Diesel engines discussion forums | 691635 | 21124 |