Here's a look at the RPO sticker in the truck.
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Also, I suppose it'd be pertinent to say - This is the current status of the build on this truck:
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It's a FULL rebuild. Truck was a light-duty C2500 RCLB with the 6-lug wheels and 14 semi-float rear end. Frame reached the end of it's useful life due to Wisconsin winters but the rest of the truck was in great shape. My plan was to shore up the frame at the cab-to-bed transition, shorten the frame, and put a shortbox on it. Sadly the frame was just too far gone and I ended up finding a 20K-mile 1991 RCSB frame in Michigan that I had blasted, epoxy primed, and urethane coated. Nothing rusty is going back on this truck.
As you can kind of see, everything is getting replaced. I just want to install the best choices going forward. The C2500 had 165K on it and ran fantastic, but... it also had 165K on it and it just makes little sense to reinstall old parts.
All that said, I just want to do this right the first time and not have regrets after the fact. If I need to go hydroboost, I will. If there's a good caliper upgrade that doesn't cost a grand, I'll do it. Just looking to buy the right parts once.
Appreciate you guys helping me through it.