Even for a Chevrolet 3,000rpm cruise is getting right up there. I think a Ford or Dodge engine would be hurting pretty badly at that pace for long periods.
Maybe you could look at some sort of overdrive. Either a change to a modern 5 speed gearbox or a bolt-on unit. I think a higher diff ratio would probably be better as you Europeans do not seem to take your vehicles bush-bashing and the unnecessary crawler first gear is just along for the ride.
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