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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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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