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 ...

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 ...