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It kinda depends on how much city/hgwy driving you do.
The more hwy the better the result.
you can look at my posts w/ Q45 and taller tires. I did 30-40k a yr so a lower rpm at 60mph was a home run for me.
First: what is rpm at 50, 55, 60 on frwy?
Second: how much (%) hwy driving do you do?
since its a truck, its probably geared to 'pull', so going to the 3.xx gear would probable work.
my 66 mustang w a straight 6 200ci had a 2.76 rear.
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