SM420 Vs. SM465: Crawl Ratios, Swaps & What Breaks First
Building a rig that crawls better than it cruises? You’re in the right place. GM didn’t make the SM420 or SM465 for smooth shifts or gas mileage. These things are cast-iron tanks, made to haul trailers, dump gravel, and inch over rocks with zero drama. Decades later, they’re still gold for trail builds and drivetrain … Read more