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I was looking at possibly buying a 2010 Sierra 4X4 with the 5.3/6 speed. The spec. sheet says that the truck comes with the 3.08 rear axle. I driving about 60% city and 40% highway. I don't tow much at all either. I was wondering if the 3.08 rear axle would be o.k.?
 

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I'd get the 3.42's, with the engine/trans combo you still will get good mpg's.
 

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My 3.42's hate the 33's could not even think about how the 3.08's would be.
 

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3.08's are weak even for the 6-spd, and I would prefer 3.42's for sure. Does GM offer 3.73's with the 5.3? If I was doing it over again, It would a 6.2 with the trailering package or nothing.
 

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i have the 3.42s with my 05 and there pretty good, the only thing i noticed that bothered me fromt he 03 to the 05 was the switch from 3.73s. towing with 3.42s was more of a hassel, but for the most part im happy with the 3.42s.

Alex
 

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i have the 3.42s with my 05 and there pretty good, the only thing i noticed that bothered me fromt he 03 to the 05 was the switch from 3.73s. towing with 3.42s was more of a hassel, but for the most part im happy with the 3.42s.

Alex
3.42's with a 6-spd are far more effective than when combined with a 4-spd.
 

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I have the 3.08's with the 6 speed 5.3L, and 33 x 12.5 x 20 tires and it definitely lacks in power and well mileage too haha, definately recommend 3.42's at least or lower if your planning on bigger tires in the future
 
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