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I wouldn't buy used gears. If something goes wrong you can't call him and say hey man theses gears are'nt complete or they or not what you promised but you can call Summit or American Muscle and if it is a problem they will fix it very quickly. Gears are not that exspensive. I think about a little over $200.00 for mine and had tehm installed for about $150.00.
i agree with blackmage, if you have them installed, they usually arent covered under warranty anymore. id say you have to know what you are looking for when you buy used.