Basically I want a 3.466 Diff ratio from a 2.6L Auto. Stock is 3.222. Also a 2.6L or 3L Manual final drive ratio... which is like 4.068/4.153 ratio, up from 3.958.

Can and how do I do these? The 2.6L and 3L Auto boxes have the same ratios for the gears... and they are both "F4A23 (2.6L) and F4A33 (3L)" model numbers, so I sense there might be some similarities between the two. I don't care if it's weaker, it wouldn't be by much if it way, and I'm prepared to pay for 2.6L gearboxes if I just take the diff from it... and the 3L Manual final drive would be ok, if it fitted.