3/4 ton gearing question

[mikep]

Been thinking about switching to an overdrive tranny but cant justify spending $1500-$2000 on an NV2500 . It'd take years to make up the gas cost savings and automatics just plain suck so that route isn't an option.


What I'm thinking about now is going to a higher gear ratio and replacing the close ratio 4 speed I have with a standard granny gear type. That way I'd keep the low first gear but I could have decent mileage in 4th. Ive got 3.54 gears in the Dana 60. Problem is I dont think Danas came with anything higher than 3.31's or so and I'd like to keep the 8 lug rear end. Another problem is that I have coil springs so I am limited to 67-72 rear ends unless I feel like changing around a later corporate 14 bolt. Did Eatons come with higher gears such as 3.07 . Maybe I could find someone who'd trade a posi 3.54 dana for a 3.07 geared posi eaton if they exist. Maybe I'm screwed and am just too picky.