Regearing my xfe tahoe

Nortex · May 29, 2016

We bought my wife a 09 tahoe with 3.08s.I really really dis-like the gears. I have 285/45/22 on it and want to know if I should go 3.73 or 4.11? It is a 6 speed 5.3 and we do a 50/50 mix of driving.

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Sdog4127 · May 29, 2016

3.08's, that's rough. It must practically idle at 70mph! 3.42's should give you about 2,000 rpm @80 mph, especially with the slightly larger wheel diameter you have over stock. I think 3.73 would be a good trade off, although I'm sure 4.10 for city driving would really pep it up. You would probably be running 2700 RPM or so @ 80 mph highway driving. I guess it depends on your preference... Good seat of the pants feeling when driving around town, or slightly better mileage when cruisin'

Good luck.

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DRC · May 30, 2016

If your towing, having lowers gear would be beneficial, if your driving mostly solo, I wouldn't bother.
Dropping to lower gears will affect your mileage, 342's, 373's would be ok, I would NOT go 411's.

Nortex · May 30, 2016

We decided on 3.73.

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M3kanic · May 30, 2016

With the 6 speed transmission 3.42 are the same as 4.10. So going with that high of a gear is not beneficial unless you are going to be doing a lot of off roading.

The information about the gearing is around here somewhere.

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Nortex · May 30, 2016

Really! I was going off my 05 sierra which I know is a 4 speed. We do very little towing. I need to read this gearing info

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EnigmaMan · Jul 5, 2016

One thing you should do is take a look at a transmission + rear gear calculator as one found here:

http://chevellestuff.net/tools/rpm_calculator.htm

GM 6-Speed 6L80 MYC Hydra-Matic Automatic Transmission (Standard Typical tranny on a 2014)

First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: 3.06

You can see the final input / speed here in the attached photo.
3.08 vs 3.73 gears + 33" tire

Note: This does not take into account tranny slippage etc so your real world values may be off +/- ~100-200rpm
Note: I changed the gear ratios and is NOT using a TH700-R4 transmission and is using the 6 speed transmission gears that come with our rigs.

Hope this helps in gearing!

3.08 vs 4.11 gears + 33" tire

fiatdale · Jul 5, 2016

3.73 is always a happy medium gear.

yukon702 · Oct 7, 2016

fiatdale said:
3.73 is always a happy medium gear.

Would there be much of a difference between 3.73 and 3.90?

Nortex · Oct 7, 2016

We did 4.10 and love them.

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Regearing my xfe tahoe

Nortex

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Sdog4127

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DRC

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Nortex

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M3kanic

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EnigmaMan

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fiatdale

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