The finned drums are supposed to dissipate heat quicker. I used to have a 1/2 ton 70 burb, and it had bigger brakes all around than a pickup, maybe you could upgrade without spending much more. Just do one brake at a time, so you have a reference point in case you forget how to put it back together. Invest the money in the proper tools( brake pliers, spring removal tool) I almost lost an eye trying to put a spring back on with regular pliers, they slipped and slammed me hard right in the eye!. Take your time and have fun with the learning curve.
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