Re: looking to make my truck motor and trans reliable
My experience with rebuilds is that considering what you pay for good parts (plus labor you have to hire out or do yourself) you are way better off with a GM factory engine or late model modern engine. I don't like the late model idea only because of the electronic upgrades you would have to do to your truck, plus possible state emissions trouble depending on where you live (some states like AZ require original equipment engine, and even 1979 trucks had some emissions equipment.)
A low horse GM factory 350 + 700R4 (built correctly with a warranty) would be what I would do. However, I would first pay a top mechanic in your area to put your truck on an engine analyzer and go over the whole truck for things that need replacing. It may be that you are better off getting a newer truck in better condition than dumping a lot of money in this old one. I am assuming that a reliable daily driver with decent fuel economy is your goal.
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