the criteria for OBS trucks are decidedly loose. Though usually, it applies to 1990s trucks from before the arrival of the GMT800-based first-generation Chevy Silverado. So, as far as we are ...

which added torsional strength that wasn’t available in OBS trucks. Chevrolet also went to 30-spline rear axles across the board with the Silverado 1500 (something that only arrived on later Old ...