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I am interested in the swap from light duty 3 speed to heavy duty 3 speed as I have changed out the stock rear end to a 3:00 for better highway driving. The downside is getting started in low requires a little more clutch work. My 49 F1 is now turning 2000 rpm at 60 mph. I love the new setup but would like to try the heavy duty 3 if it is a bolt-in.