[trooper Tdiesel]

is it a S\B reg cab or a L\B extra cab, or one of the other combos
that makes a big difference in the empty LBs and amount of power needed to move it..

what tire size are you running on the F150
something around 235/75/15 was the OE size...


i see them swapped to 31"s all the time and it affects them a fare amount..

2.73/3.08/3.27/3.55/3.73/4.11/4.55

where made for the F-150s in the 1980 to 95ish models
the 3.27 ratio may only be a 90s thing..and the LSDs only fit the 3.08 and up diffs.

under stand the more you rigg it for light loads on the open road, the more it will hurt your loaded and or city mpg...
as the saying goes there's no free lunch when it come's to gearing...

for road mpg.....
0.01c down size the tires and compensate with the final ratio....

i figure a 2.73 with a 4sp would be about the best
though ether version of the ZFs driven as a 4sp would work as well.
with the deep 1st it would be ok, though they have a very tall reverse...

a direct drive gear with a 2.73 makes for about the same as the 3.55 with the O\D
mixing the 2.73 with the 25% O\D and 215/75/15 makes for about 1,500 at 60 VERY MUCH A FLAT LAND EMPTY GEAR.


the 300s are old enuf there computers are not specd for E10 there all pre OBD-II 1996
if you can find E0 gas that's with in 0.30 cents of E10 it would be brake even or lower cost per mile..to run E0 gas..

edit..gearing list of all the different ZFs.
ZF Manual / Standard Transmission Identification Parts and Diagrams