I think I need to refine my question / premise that I am operating under. I intend to tow in 3rd, exclusively. Is the reason that people use higher numerical gear like 4:30 and 4:56 ratios so that they can remain in OD longer without dropping to 3rd as much, or for increased power in the 1:1 ratio (3rd in my trans.)? I don't intend to make use of OD at all. I just want to know from those who have experience if I can expect my Excursion to hold 3rd reliably or if the 3:73 ratio is going to make it want to grab 2nd. If that's the case, I will put in 4:30s and be done. I don't care about OD.