GM Inside News Forum banner
sierra at4
1-1 of 1 Results
  1. Automotive Industry & GM News
    GMC has just announced a new package for the new Sierra 1500 AT4 to help you get off-road a little faster than before. An all-new Off-Road Performance Package that adds power to the biggest of the Sierra's V8s. The base AT4 comes with the 5.3L V8 that puts out 355 hp. But the Off-Road...
1-1 of 1 Results