GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

new vortec 5.3 XFE?

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Old 02-16-2009 | 07:18 PM
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Originally Posted by nighthawk08
Soft tonneau cover (improves aerodynamics)
Extended front lower air dam (improves aerodynamics)
Lowered suspension and revised chassis tuning (improve aerodynamics)
Aluminum lower control arms (reduce mass)
Aluminum spare wheel (reduces mass)
Seventeen-inch aluminum wheels (reduce mass)
Automatic locking rear differential
Trailering package
Low rolling resistance tires
sounds pretty good to me. and yea the 6sp with 3.08s would feel like my 4sp with 4.10s.. so good deal
Old 02-17-2009 | 12:21 AM
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so what about a 6 speed with 3.73 ?????
Old 02-17-2009 | 12:49 AM
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Originally Posted by m3srt
so what about a 6 speed with 3.73 ?????
even faster..
Old 02-17-2009 | 12:54 AM
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i dont get it ?????
Old 02-17-2009 | 12:57 AM
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Originally Posted by m3srt
i dont get it ?????
what?
Old 02-17-2009 | 12:59 AM
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Originally Posted by niugnep
I wonder how much weight those parts save?? Anybody know??
I know the spare could be an easy 10-20lbs, not sure on the control arms, every little bit helps though
Old 02-17-2009 | 01:06 AM
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Originally Posted by nighthawk08
3.06 x 3.73 = 11.41
4.03 x 3.08 = 12.41

First gear with the 6L80E and 3.08 gears will feel better than first gear in a 4L60E with 3.73's.
Originally Posted by m3srt
i dont get it ?????
Basically, you have a better 1st gear in the transmission to compensate for the 3.08 gears. but the gearing in the transmission and the 3.08 gears are better MPGs at cruising speeds.
Add that to lighter truck with less drag and its way better.

I wasn't considering the transmission change originally
Old 02-17-2009 | 02:00 AM
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the part that i dont get is that lets say a 3.73 is good off the line ...

3.42 is kinda weaker than 3.73

3.23 sucks ***** ...

3.08 should be smaller than 3.23 correct then it should SLOWER ?? off the line ???

but ppl keep sayin about the 6 spd


i test drove a crew cab 5.3 with 3.42 and 6 spd and it sucked .. so thats what i dont get ....
Old 02-17-2009 | 02:06 AM
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Originally Posted by m3srt
i test drove a crew cab 5.3 with 3.42 and 6 spd and it sucked .. so thats what i dont get ....
Compared to what? your RCSB?
Old 02-17-2009 | 02:13 AM
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yea , i know my truck has more ***** than a crew cab , but it was just .... BLAH lol

btw i have a 3.42 as well



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