Your truck has a 3.41 to 1 axle ratio and spins at 2950 RPM at 65 MPH with the stock tires. If you had the five speed trans it would be spinning 2250 RPM at 65 MPH. Five speed versions use a different axle ratio along with the overdrive. Axles are 3.7 instead of 3.4.
Putting those Tracker tires on there increases the circumference of the tires by 7" and ground height by over an 1". It will spin 2690 RPM at 65 MPH instead of 2950 RPM. Wind resistance and ground friction is increased, but not by a great amount.
In the end, you'll probably lose a little fuel mileage, not gain - unless all your driving is on flat roads. I suspect your truck has just barely enough power as it is.
My 85 Isuzu truck is 4WD with a 2.2 diesel, and is geared the same as a gas version with a four speed. But, I've got low range to use since mine is 4WD. I know that my truck would be useless with bigger tires in normal (high) range since it's gear to fast in 1st gear already.
By the way, I wish those Trackers had smaller wheels; they'd do much better in ice and snow that way. I've got six 4WD Trackers, and they all skid around like roller skates with those 15" tires.
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