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#1
07-13-2006, 03:56 AM
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Re: Crawl Ratio??
#2
07-13-2006, 07:12 AM
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Join Date: Jul 2005
Posts: 4,123
Re: Crawl Ratio??
Not sure how accurate that is. Its from 2004 and they still list the two different rear axle ratios.
From Hummer's site:
CRAWL RATIO:
BASE VEHICLE: 45.0:1
WITH OPTIONAL OFF-ROAD SUSPENSION PACKAGE: 68.9:1
No mention of man v. auto. 
http://www.hummer.com/popups/h3/h3_full_specs.pdf
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#3
07-13-2006, 11:05 AM
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Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: Crawl Ratio??
H3 came out in 2006, what they listed in 2004 is innacurate. The H3 uses only one gear ratio for any model in 2006 and that is 4.56:1.
Quote:
Originally Posted by Sewie
Not sure how accurate that is. Its from 2004 and they still list the two different rear axle ratios.
From Hummer's site:
CRAWL RATIO:
BASE VEHICLE: 45.0:1
WITH OPTIONAL OFF-ROAD SUSPENSION PACKAGE: 68.9:1
No mention of man v. auto.
http://www.hummer.com/popups/h3/h3_full_specs.pdf
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#4
07-13-2006, 03:43 PM
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Join Date: May 2005
Location: Southern California
Posts: 829
Re: Crawl Ratio??
Look at the H3 Brochure from the dealer.
It has both the auto and manual ratios. Sorry my book is at home.
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Desert Dan
H3 2006 Adventure/Lux/5-speed/sunroof/rock rails/underbody skids/block heater/Boulder Grey/ Defender Roof Rack
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#5
07-13-2006, 04:46 PM
Hummer Veteran
Join Date: Jul 2005
Location: San Francisco
Posts: 192
Re: Crawl Ratio??
You also need to factor in the torque multiplication of an auto, usually giving a 4x at the lowest revs needed for rock - crawling.
This will equate to closer to 200:1 for an auto transmission (and you won't need three feet while rock crawling).
-C
#6
07-13-2006, 05:03 PM
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Join Date: Jan 2003
Posts: 24,247
Re: Crawl Ratio??
that's just stupid.Quote:
Originally Posted by FormerJeeper
You also need to factor in the torque multiplication of an auto, usually giving a 4x at the lowest revs needed for rock - crawling.
This will equate to closer to 200:1 for an auto transmission (and you won't need three feet while rock crawling).
-C
You are suggesting the automatic transmission quadruples the torque over a standard transmission?
#8
07-13-2006, 09:20 PM
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Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: Crawl Ratio??
Quote:
Originally Posted by Desert Dan
Look at the H3 Brochure from the dealer.
It has both the auto and manual ratios. Sorry my book is at home.
This has been discussed a few other times, and sorry to tell you, the brochure from the dealer is incorrect. (That's why it has a little disclaimer on the bottom talking about errors.) 
I have personally checked with the axle engineer in charge of the H3 (quite a few times on other subjects too
), the brand quality chassis manager has been in our facility quite a few times, and the service engineer for this part is a close friend...it is a 4.56:1 ratio in the Diffs.
(Trans 1st gear ratio x transfer case ratio x axle ratio = crawl ratio)
AUTO
Off-Road:3.059 x 4 x 4.56 = 55.796 (rounded to 56:1)
Non-Off-Road: 3.059 x 2.64 x 4.56 = 36.825 (rounded 37:1)
MANUAL
Off-Road: 3.78 x 4 x 4.56 = 68.947 (rounded 69:1)
Non-Off-Road: 3.78 x 2.64 x 4.56 = 45.505 (rounded 46:1)
NOTE: The manual first gear might be 3.79, I came across two specs in my PAD drawings for this gear.
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#11
07-13-2006, 11:03 AM
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Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: Crawl Ratio??
Sounds right to me, can't remember the auto, but know it is in the mid to high 50s, so I would say you have it correct.
Quote:
Originally Posted by HummBebe
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