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4:10's in 99.

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Old 06-29-2007, 10:28 PM
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Default 4:10's in 99.
I have a 99 5.3 with 3:42's and am looking to go to 4:10's. My tire size is 255/55/18. If your wondering about the tire size, it's on a 4/6 drop. 4:10s good choice? Any opinions.?
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Old 06-30-2007, 02:42 AM
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I have yukon 4.11's with an eaton posi. I love the launch! Although it will drop your top MPH, It'll scream compared to what you have now. I made the exact swap as you from 3.42 to 4.10. On the street, there is much less down shifting for simple passes which I think helps gas milage, not that it matters Get em!
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Old 06-30-2007, 02:57 AM
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FYI...All gear ratios are stated for a 26" tire. Most trucks don't run the actual ratio they buy anyway"taller tire". In short Go big, get the 4.10's
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Old 06-30-2007, 09:10 AM
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I went from the 3.42's to 4.10's in my 01 rcsb and love them. With out a doubt the best money I spent.
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Old 06-30-2007, 02:47 PM
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my 99 came with 3.42's.. i switched to 4.10's and havent looked back.. i noticed a huge improvement as well
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Old 06-30-2007, 10:44 PM
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Cool, thanks for all the tips!
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Old 07-01-2007, 10:19 AM
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Anyone know the formula for final drive ratio with the tire dia. factored in??
I'm running 29" tall tires with 3.73's ???
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