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If the motor has good compression, the 4x4 works, and it is not hacked together (3" body lift) then it is worth $2500. Even with a bad transmission. 1978-1979 are very desireable years.
Id just take a good look at it, crawl underneath it and check for excessive rust and leaks, and then drive it. If it drives nice and doesnt make any weird noises, Id go for it.
Octane