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Re: 1978 full-time 4x4. Is a 700r4 worth it?
The key is, find your motors torque curve and gear for it. ALL my trucks run 1600-1650RPM at 55 - 5.3/4L60E/3.23 3/4 ton, 4.3/700R4/3.08 1/2 ton, and 6.2 diese/700R4/3.08 1/2 ton. Any less RPM, lugs excessively. Any more, wasting fuel.
One of th rare cases where math is your friend. But be honest - if you want MPG buy a Cruze and use your truck only when desperately needed.
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1987 2 ton 
1982 250/TH350 beater in progress
Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping
Plus a mess o' tractors
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