I would ask what kinda help does your truck need?
An Edge EZ will give you a slight mileage and power increase. But if you are suffering from high water temps or just can't pull the gear, you may have to make a change.
And that all depends on how you use your truck. If you tow often, a gear in the 4. 10 range may be more acceptable. Or if you are running a tall tire, shorter rubber can help out as well.
The bottom line is it's not one size fits all. If you tow twice a year, I would put up with it. But a gear change will feel like a bunch of HP and will take the stress off the clutch, trans and engine.
And yes, gauges first!!!
Dave