Quote:
Originally Posted by wyattglock
I had a 2003 GMC Sierra 1/2 ton extended cab with the 4.3 and 4l60E. Granted it was a better injection system, but even with a 5000lb truck I got 22mpg with 3.42 gears. If you are running the 700r4 and have a well tuned engine, I don't see why you couldn't see similar numbers in your truck. It will be a dog off the line, but then if you are looking for reliable, daily driver traits, it will be hard to beat.
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3.42 vs 3.08s will make a huge difference with that motor though. At 3.08s, the 4.3L is just waaaay out of its power band, especially the older TBI models.