Anybody using an overdrive trans in with a toploader? I'm running a 4spd toploader with 3.5 gears and a trac loc 9" diff. I love the low end gearing an performance but would love to get more high end for occasional highway driving. I could either go with a T-5 swap or add an overdrive-gear splitter trans. Does anybody have experience with these units and can give me some perspective on pros, cons, installation ease and comparason w/ T-5 performance? Thanks for the help!!