I wouldn't recommend just swapping a GMT800 booster in place, unless you swap the entire brake system, including a GMT800 hydroboost. Between quick take-up systems, drum versus disc proportioning valves, and the liability of grinding on brake components to get them to fit, there's way too many opportunities on our trucks to end up with a brake system that feels fine until you get into an emergency situation. There are people on this forum who went to a GMT800 master cylinder and then reverted back when the brake system didn't work right in an emergency stop.
Note that I am not against mixing and matching brake parts to get better brakes, but you need to know what you're getting into. There are far too many people who will tell you "just swap it".
Note that I am not against mixing and matching brake parts to get better brakes, but you need to know what you're getting into. There are far too many people who will tell you "just swap it".