If you go the T5 route, please be careful to get one (a T5, that is) with the right gear ratios for your rear end. If you're careful you can get a T5 with gear ratios which will make your AD drive almost exactly like stock in the first 3 gears. The beauty of this is your AD truck will feel just like it did with the 3 speed but all gears will be synchronized. Then 4th will be your first overdrive and 5th will be your second overdrive. It all has to do with your final gear ratio. I've posted this several times. Please let me know if you need more information.