Thread: Gear ratio for rear with GM Vortec Engine

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Aluminum is 1/3 the weight of iron, however not all parts will be aluminum---you might end up saving 20 to 40 lbs

Thanks for the feedback. Found '97 Thunderbird rear assy complete with rotors and brakes. It's not positraction, but only has 16000 miles!! Paid $225. Rotors are right at nominal for new rotors. Should work fine.
1) Does anyone know if the rust on the rotors should be cleaned off by machining, or is there a different method?
2) This rear axle has sat outside for quite a few years so the boots will need to be replaced. Is it likely the rear end seals and brake caliper will also need replacement?
Thanks