i think im just gonna keep the 3.00 and myabe get a posi unit... i have to drive this car 20miles one way to school everyday until i move this summer and i like being able to take it on road trips. i saw an adapter plate to adapt a ford AOD to an FE but i'm not sure if an AOD could handle the power from that 406 for very long. if i had over drive i could put in a 4.11 or something. i found a TCI C6 for about $650 from Summit that sound like a good deal but then i back to the same problem....only 3 gears. anyone have any 4 speeds they wanna sell?