For what it's worth, my Insight has a 1.0L engine. It has a 3.208 final drive and 0.710 5th (top) gear. With its default tire size the engine is turning at 2217rpm @ 65mph, and 1875rpm @ 55mph. That works out to approximately 4.5% shorter than your truck's gearing. Pretty close indeed, and my new engine/transmission will be even closer.
Another important factor, it weighs 1850lbs, and has 66ft-lbs of torque. That works out to around 71ft-lbs of torque per ton.
With the IMA in place (which I've removed) it had 90ft-lbs of torque. That works out to 97ft-lbs per ton as the target Honda was aiming for.
With the IMA, the car was spunky and fun. Without, it's pretty slow, but accelerates fine if you wring it out.
Your truck weighs in at ~3100lbs (?) and 135ft-lbs of torque (?), best I could find. That works out to ~87ft-lbs of torque.
Or, in other words, you have about 25% better power to weight than I do right now
but I'd consider your gearing to still be quite tall.
EDIT: If you have a 3.45 right now, to have similar gearing to my Insight (in terms of power to weight, ability to accelerate in each gear) you'd need a 2.76 final drive.