Re: 4.3l vs. 5.7l in a commuter truck
I'm happy with my 4.3. Gets about 20 mpg usually, 22 if I baby it. 4.3, manual overdrive trans (.73 or .70:1), 3.73 gears, P235 tires. I use it exactly as you have proposed; mostly back and forth to work, with some occasional light hauling or trailer towing.
It moves out ok, and will go as fast as traffic will allow.
The only downside I see is that it has a little bit of a vibration at idle - and - you don't get that V8 sound....
K
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