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03-17-2009, 07:54 PM
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Hummer Novice
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Join Date: Mar 2009
Location: Visalia, CA
Posts: 14
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Front and Rear Diff Gears?
What is a good ring and pinion ratio to run with 40" tires? Any suggestions on where to buy from? Thanks!
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03-17-2009, 09:23 PM
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Hummer Veteran
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Join Date: Mar 2008
Posts: 205
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Re: Front and Rear Diff Gears?
Search Button does wonders......
For 40's i would run 4.88 and you can get them from trailduty.com
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03-18-2009, 12:59 AM
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Hummer Guru
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Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
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Re: Front and Rear Diff Gears?
I agree.
When I ran 38's, I installed 4.56 gears. The whole point was to keep the same end gear ratio.
4.10's-33" = 4.56's-38"
So, I'd try 4.88's.... besides, you don't want anything lower, it doesn't make for good daily driving.
Mark
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03-18-2009, 04:58 AM
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Hummer Novice
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Join Date: Mar 2009
Location: Visalia, CA
Posts: 14
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Re: Front and Rear Diff Gears?
What gear ratio comes stock in the '05 H2 SUV?
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03-18-2009, 05:39 AM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Re: Front and Rear Diff Gears?
Quote:
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Originally Posted by r-cman
What gear ratio comes stock in the '05 H2 SUV?
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4.10:1
They changed to 3.73:1 in 2008+
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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03-20-2009, 06:01 AM
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Hummer Guru
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Join Date: Jan 2004
Posts: 7,060
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Re: Front and Rear Diff Gears?
Quote:
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Originally Posted by tomp
4.10:1
They changed to 3.73:1 in 2008+
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Why did they do this? Due to the 6speed trans or extra hp?
I wonder how 4.56's would be with 37's on that truck...or if it's even needed on that engine/trans setup.
__________________
TAIL RATED!
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03-20-2009, 06:11 PM
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Hummer Authority
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Join Date: Sep 2005
Location: Texas
Posts: 1,795
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Re: Front and Rear Diff Gears?
Quote:
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Originally Posted by timgco
Why did they do this? Due to the 6speed trans or extra hp?
I wonder how 4.56's would be with 37's on that truck...or if it's even needed on that engine/trans setup.
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Both reasons
If it were me, I would be putting in a front locker and swapping the gears for the 37s. I would at least use 4.10s and you should be able to find a good deal on them as several 03-07 H2s have changed out their gears and will have the 4.10s to sell cheap. I have a set you can have for $100 plus shipping.
__________________
H2 SUT 4.56 Gears, Front Locker, Cognito Pitman/Idler kit & Idler Pivot Kit, Fab Tech Tie Rods, True Tech Trailing Arms, Edelbrock Panhard Rod, PML rear Diff & Tranny Pans, Corsa Exhaust, Dynatech LT Headers, Diablo Predator Programmer, Volant CAI, Warn 9500 Winch, Escort 8500x50 & ZR3 Laser Shifter, Delta Light Bar, Rancho Steering Stabilizer & Bilstein Shocks, Ron Davis Radiator, PowerSlot Rotors, Hawk Brake Pads
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