Has anyone tried changing from stock gears on a V6 automatic to 4.10's. Or is it a waste of money on a V6. I'm not even sure what stock gears I have now (I think 2.73's)? Do I also have to change to a posi (T-Lok) in order to use the 4.10's? I'm sure my stock gears on my '03 (Auto. Trans) do not have T-Lok. I don't even think they were an option on the V6 Automatic. Any insight on this is greatly appreciated.