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The link I sent you for the wilwood adjustable proportioning valve should work fine. It did for me. Like I said before, the stock master cylinder did just fine and the truck stops great with the 37" tires. In fact, it stops better than it did with the stock 33's and stock brakes it came with. Now, I can really stand on the brakes and they don't lock up in traffic like they used to. 5pm traffic jams used to be kinda scary with the bigger tires and panic stops made you look for a place to go. I looked into replacing the master cylinder on mine with one from a 2001, 2500, but the dimensions on the one they showed me at the auto parts store wasn't going to line up with the truck. I don't remember exactly, but the piston size was biggger and it was larger in the bolt up area, I think. Anyway, once I got the proportioning valve dialed in the brake trouble light went out. Good luck with what you decide. Let me know if the master cylinder bolts up, I may want to upgrade mine. I believe the 2500 disc brake model has a larger resevoir for the back brakes.