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To keep it in stock condition, you would want to go with the 4L80, which is the 3/4 ton tranny. I do know there's a great handful of trannies you can put in this badboy, I just dont have the list hanging around....Find a 2 speed powerglide to put in there for no reason :rofl: Sure, you'll burn through tires like there's no tommorow but who casres 
