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03-26-2010, 03:31 PM
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Hummer Veteran
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Join Date: Jan 2008
Location: Hot Springs, Arkansas
Posts: 151
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Re: which gears? 4.56's or 4.88's?
I would say go with the 4.88's.
As we all know, the H2's are gas pigs anyway. So with mpg not even being an option, the 6.0 motor does well and has plenty of power at higher rpms. Also, you might change to bigger tires and/or wheels in the future (I know I did...35's, to 37's, to now 39.5's).
Thus, unless you are rolling 90+ on the interstate extremely often, I think the 4.88 gearing would be the way to go.
DUCK
__________________
2003 H2, Lux & Adv Packages, Cognito 3" front suspension lift, Gobi Stealth Rack w/ Ladder, Navigation, twin Optima battery setup, AirRaid Intake, Granatelli Mass Air Flow Sensor, Flowmaster Big Block II Exhaust, Diablosport Predator Programmer,Cognito Pitman/Idler Arm Kit, Fabtech Tie Rods, Rancho RS 9000 shocks, Warn bumper and 9.5x winch, Warn light bar, PIAA's everywhere (14), everything blacked out, and rollin' on 39.5" Super Swamper IROKs on black powdercoated stock wheels.
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03-26-2010, 03:53 PM
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Hummer Veteran
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Join Date: Oct 2008
Location: San Diego, Las Vegas area
Posts: 192
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Re: which gears? 4.56's or 4.88's?
sweet  a gear thread! Hopefully Pahrump and Kalantar will chime in. Can't wait to read more responses from you guys.
http://www.4x4offroads.com/gear-ratio-chart.html
Last edited by StockStar : 03-26-2010 at 10:46 PM.
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03-28-2010, 04:33 AM
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Hummer Professional
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Join Date: Jan 2004
Location: Socal
Posts: 272
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Re: which gears? 4.56's or 4.88's?
Someone clarify this for me, 4:88's would give you better mpg on the freeway than 4:56's? I upgraded to my 4:56 (with 37s) and doesnt improve my mpg or towing mpg by much, maybe I should have gotten the 4:88s?
Now at 2000 rpm I average 54 mph, what do you stock guys get on 37s at 2000 rpm?
As far as the pricing, I paid I believe $1400 or $1500 with parts, that was the going rate in my area. I would let them buy the parts because if something goes wrong, that warranty will be helpful. I would try to negotitate with them.
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03-28-2010, 06:16 AM
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Hummer Expert
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Join Date: Mar 2009
Location: Burnsville, MN
Posts: 657
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Re: which gears? 4.56's or 4.88's?
Quote:
Originally Posted by kalantar
Someone clarify this for me, 4:88's would give you better
Now at 2000 rpm I average 54 mph, what do you stock guys get on 37s at 2000 rpm?
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you mean at 54mph you are running at 2k rpm?
ill have to see what i rub at, at that speed, but if you have the 6 speed tranny, that will throw off the results.
i have an 03 with the 4 speed
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03-30-2010, 01:52 AM
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Hummer Expert
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Join Date: Sep 2007
Location: Mason, OH
Posts: 779
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Re: which gears? 4.56's or 4.88's?
I am running 37's on stock 4:10 gears. I will let you know what mine does tomorrow.
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03-30-2010, 06:15 PM
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Hummer Expert
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Join Date: Mar 2009
Location: Burnsville, MN
Posts: 657
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Re: which gears? 4.56's or 4.88's?
at 70mph i run at 2200rpm
60mph @ 1700rpm
03 H2
stock gears - 4.10
37 inch BFG KM2 M/T
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03-31-2010, 02:01 AM
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Hummer Professional
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Join Date: Jan 2004
Location: Socal
Posts: 272
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Re: which gears? 4.56's or 4.88's?
Correction, at 2000 rpm I am at 63mph....
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