Rc/sb 5.3 six speed?

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Feb 26, 2010 | 07:17 PM

#21

fastnblu

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Quote:

Originally Posted by ForkHorn

Anyone have any idea what the difference in gas mileage the 6 speed would give you with the 5.3? Its not listed anywhere on their site.

Edit: doing some google searches... I came up with 15 city and 21 highway.

Not to turn this into a MPG thread, but my '04 was rated 16/19. So it's gotta be better than that. My guess 16/21 & if it's not listed, might be too early. Didn't they just start puttin em in ECSB 1500 for 2010? A coworker I was talkin to told me he gets 15-18 CTY/ 23 HWY on his 08 w/. AFM. I asked rear gear & he thinks it's 3.73. Even so, I'll guess 7% better goin from 60E- 6L80E.

Quote:

Originally Posted by 2001c3driver

I don't know about better mileage with the 6L80 on the 5.3. How much power does it take to turn that box over. Granted it's mandatory behind the L92.........

See above comment on better MPG. I don't think power consumed is as much as you'd think, but if I knew that answer, I'd prolly be an engineer.

sand man, 6.2 in a 1500 RC, I'd love to see.

Quote:

Originally Posted by ForcedTQ

My girlfriend just got one @ the beginning of last week. It's a GMC Sierra SLE 4x4, and damn is it a nice little regular cab. The thing handles like it's on rails (well for a truck anyway), and even though I haven't "gotten on it" (waiting for break in period to pass) it's damn quick! I'll report back in the next week or so after we do the first oil change and get a chance to go full throttle. She just passed 1400 miles, so it's coming quickly. BTW, this is a work truck, hence the high miles already traveled in two weeks.

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