6 Speed auto tran.

Wouldnt a 6 speed automatic tran help gain a couple mpg?

 

Depends.

 

Damn! I want the A760F from a 4.7L Tundra. 1st 5 gears are the same as our 5 spd and then you have a 2nd overdrive. Would help me out with RPM's and my 4.88 diff gears.

To answer this, I would say probably not. When I went to 33" tires my rpm's were so low at 75mph (about 1900-2000rpm) that the tranny would stay in 4th gear rather than 5th. I don't think our motors make much power at that range compared to the factory rpm of about 2300 at 75mph. If you were competely stock and shifted into the 6th gear from the A760F you would drop down to 1800rpm and might not have enough power to break the wind and it would shift back into 5th gear making 6th pretty much pointless...