GVSII, your truck needs a six-speed manual transmission to perform well, which kinda proves my point. Back in the day we got by with four-speed transmissions, which really had only three usable gears. You would not be very happy if your truck had a four-speed rather than a six-speed.
But your truck is almost ten years old, and we're talking about current production trucks. Let's see how things have changed: Your '06 5.4 is rated 300 hp @ 5000 rpm, 365 lb-ft @ 3750 rpm. That's a pretty fast-turning engine. But the current production 5.0 is rated 360 hp @ 5500 rpm, 380 lb-ft @ 4250 rpm. Engine rpm for both peak power and peak torque have gone up a whopping 500 rpm! Should you swap your 5.4 with the 5.0, you'll probably wish your six-speed tranny had a couple more splits. And don't expect the trend of ever-higher engine speeds to stop; the easiest way to get more power out of an engine is to increase its rpm.
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