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Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > General H3 Discussion

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  #1  
Old 06-30-2007, 02:33 AM
Pewterbird Pewterbird is offline
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Default Can Somebody Explain Gearing

From what I understand

D Normal w/ Overdrive
3 Normal w/o Overdrive
2 Lower
1 Lower

Then the transfer case has two gears:

Hi and Lo

So there are 8 combinations.

How do they interact and whats the difference between like 2LO and 1HI? I guess I dont' understand how they interact?
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Old 07-03-2007, 03:27 AM
Pewterbird Pewterbird is offline
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Default Re: Can Somebody Explain Gearing

No one knows?
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Old 07-03-2007, 06:26 AM
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Default Re: Can Somebody Explain Gearing

you got the transmission ones rite.

the transfer case has 3 selections. there is no 1 or 2 its just high and low, but i guess if you want you can think of it as 1 and 2. you have HIGH(unlock), HIGH(lock) and LOW(lock). the lock/unlock refers to whether the front and rear axles will be getting equal power or not.

so if you wana be technical you do have 8 gears, but in reality you dont. on the street you have 4 drivable gears, and on the trail you have 8, but you dont go 1,2,3,4,5,6,7,8, you can go high 1,2,3,4 or low 1,2,3,4. also on the streats you wouldnt go far driving in low, its too damn slow and torqy and the axles are locked.

hope this helps, and i hope i didnt mess up and write something stupid in there.
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Old 07-03-2007, 04:26 PM
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Desert Dan Desert Dan is offline
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Default Re: Can Somebody Explain Gearing

Lucky you don't have a 5-speed

You can use all 4 gears in your automatic in 4 hi 4hi locked or 4 low.

in 4 low the auto with shift up rapidly if you don't put the shift lever in 1.

If you have the Adventure model the low range the gear ratio is 4:1!
When in low the engine will be reving up and you will hardly be moving.
The rear axle locker can lonly be activaed when in low range

Low range should be used on steep hills (up or down) and whenever low speed and power is needed.

Have fun and see what it will do.
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Old 07-03-2007, 05:48 PM
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Default Re: Can Somebody Explain Gearing

Here is a cool little graph that shows you the mathmatical equation to find out your final drive and crawl ratio.

http://www.offroaders.com/tech/mph-crawl-ratio.htm


You will end up with an answer like 58:1. The higher the left number, the higher your RPMS will be at a lower speed and the purpose being that you are transferring maximum torque and HP to the wheels and ground at low low speeds.
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Last edited by stagger_lee : 07-03-2007 at 05:57 PM.
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Old 07-03-2007, 06:14 PM
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Default Re: Can Somebody Explain Gearing

i use 1st and 2nd in low range for going very slow . 1st going down steep stuff .

hi range is good for sand and snow when you dont need to crawl




1st gear no brakes no problem
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