Now that is a cool truck. I always wanted to build one for max economy.
The payload on those was like 2600 lbs. ...compare that to a new 2wd tacoma with a 1200 lb payload. Small frontal area for a truck. And with a change in gearing I bet you could get the Tacoma mpg numbers.
I'm pretty sure you have the 8" rear diff with something like 4.10 ratio which you could swap out for 3.42 or maybe 3.07 and the best 5th gear would be a w58 trans.
Please post pics of your truck
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