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Old 07-27-2010, 08:33 PM   #1
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What is your crawl ratio?

Here is an interesting link many will find educational:

http://www.californiajeeper.com/crawl-ratio.htm

and also another link from the jeep forum about how to find some of this information out:

http://www.jeepforum.com/forum/f9/stock-tj-specifications-452871/

As it stands my crawl ratio is 37.242784.

Using the above methodology, what is yours?

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Old 07-27-2010, 08:42 PM   #2
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I don't know the ratio but its FAST I wouldn't be surprised if its the fastest crawl evah

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Old 07-27-2010, 08:47 PM   #3
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Mine is 55. 4.88 axle ratio X 4.0 transfer case ratio X 2.84 42RLE 1st gear ratio = 55.4.

Technically it is 55 but in reality, with the automatic transmission's torque converter, it is actually significantly higher than that due to the automatic torque converter's infinitely low first gear ratio.
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Old 07-27-2010, 08:52 PM   #4
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Quote:
Originally Posted by Jerry Bransford View Post
Mine is 55. 4.88 axle ratio X 4.0 transfer case ratio X 2.84 42RLE 1st gear ratio = 55.4.
Nice! So the California Jeeper website suggests that for a good crawl ratio you want your ratio to be between 50:1 and 70:1.

My downfall is my gear ratio (3.07). Need to up it up I think. I'm just more concerned about highway (high speed) driving than off-roading performance.
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Old 07-27-2010, 09:02 PM   #5
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My crawl ratio is 20:5

as in after drinking 20 beers I can crawl 5 feet

I honestly don't know my ration, I just couldn't help posting that answer...
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Old 07-27-2010, 09:06 PM   #6
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Only 38.85! That sucks! 3.73 gears for now
AX15 transmission has 1st gear ratio of 3.83
NP231 Transfer case low range ratio of 2.72
Differential gear ratio of 3.73
3.83 X 2.72 X 3.73 = 38.85
4.10 = 42.71
4.56 = 47.50 This is what I want but between 50 and 70? I don't think those are daily drivers.
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Old 07-27-2010, 09:07 PM   #7
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Quote:
Originally Posted by ryt2112 View Post
My crawl ratio is 20:5

as in after drinking 20 beers I can crawl 5 feet
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Old 07-27-2010, 09:10 PM   #8
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Quote:
Originally Posted by EdJonesJeeper View Post
4.56 = 47.50 This is what I want but between 50 and 70? I don't think those are daily drivers.
I agree. I think the 50 - 70 range is for more serious off-roading.

Thinking that 40 - 50 would be better for the daily driver.
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Old 07-27-2010, 09:18 PM   #9
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Mines 40.68 :: w/ NV3550/NP231 and 3.73's

I like it how it is. I might through in 4.10's sometime if i find some nice used ones for cheap, even then the ratio goes to only 44.72. I don't do large rocks or things that actually need the high ratio.
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Old 07-27-2010, 10:24 PM   #10
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87.3 with 5:1 Atlas, 3.83 first gear & 4.56 gears and I wish it were higher for the more difficult trails. It is my daily driver. The controlability difference between what I have now and where I was with the NP231 is remarkable. Remember, this is your crawl ratio in low range. The ratio of the transfer case is 1:1 in high range, making my "crawl" ratio in high range 17.5:1. Couple that with 35" tires and I'm back around the factory ratio with 30" tires and 3.73 gearing.
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Old 07-27-2010, 10:42 PM   #11
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73.45 to 1.
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Old 07-28-2010, 10:06 AM   #12
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Quote:
Originally Posted by Ken Steele View Post
87.3 with 5:1 Atlas, 3.83 first gear & 4.56 gears and I wish it were higher for the more difficult trails. It is my daily driver. The controlability difference between what I have now and where I was with the NP231 is remarkable. Remember, this is your crawl ratio in low range. The ratio of the transfer case is 1:1 in high range, making my "crawl" ratio in high range 17.5:1. Couple that with 35" tires and I'm back around the factory ratio with 30" tires and 3.73 gearing.
Exactly, a high crawl ratio is only when you're in 4Lo so having a good high crawl ratio doesn't really affect its daily driver abilities.
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Old 07-28-2010, 10:10 AM   #13
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51 to 1. NP 231, AX-15, 4.88 gears. I am good with that .
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Old 07-28-2010, 10:13 AM   #14
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Mine's about a 12-pack. Any more than that and I'm definitely crawling.

Sorry ryt2112, I didn't see your previous post.
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Old 07-28-2010, 11:53 AM   #15
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A good crawl ratio is definitely a must - when she loves it on all 4's.
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Old 07-28-2010, 12:10 PM   #16
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50:1 for me. is there a way to figure out a ratio for 4hi?

just saw ken steeles post
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Old 07-28-2010, 12:23 PM   #17
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Old 07-28-2010, 12:24 PM   #18
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my YJ has 4.88 gears X 3.06 700r4 X 2.72 231C = 40.617 on 36" TSL's (needd a 4.0 xcase)

my JK has stock 3.73 X 2.84 42RLE X 2.72 NV241 = 28.8 wow! on 32" BFG's good thing its got daily duty (want the rubicrawler for an extra 2.72, would give me 78.37!)
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Old 07-28-2010, 12:31 PM   #19
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Looks like mine is 40.69.
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Old 07-28-2010, 12:50 PM   #20
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Quote:
Originally Posted by wasurfer86 View Post
is there a way to figure out a ratio for 4hi?
Just don't include the 2.72 when multiplying since in 4Hi, the tcase ratio is 1:1.
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Old 07-29-2010, 12:46 AM   #21
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Quote:
Originally Posted by Jerry Bransford View Post
Just don't include the 2.72 when multiplying since in 4Hi, the tcase ratio is 1:1.
i caught that once i re-read ken steeles post. thanks though
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Old 08-30-2011, 12:41 PM   #22
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To get a number for the "crawl ratio" or "overall gear ratio" of the low range setting in 4WD, first gear of transmission, transfer case ratio (in 4Lo) and axle differential ratios are multiplied. (For vehicles with automatic and/or geared hubs those ratios need to be factored in as well).

A good 4WD with manual transmission should have a crawl ratio of 40:1 or better, with an automatic transmission 30:1 or better.
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Old 08-30-2011, 12:56 PM   #23
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I'm at 4.01 X 2.72 X 4.56 = 49.7368


I did'nt know the 1st gear gearing was diffrent with the manual NV3550
NV3550 - 2000-2004
* 5 speed manual
* Used with 6 cyl models
* 10 spline input
* 23 spline output

* Ratios:
1st - 4.01
2nd - 2.33
3rd - 1.39
4th - 1.00
5th - 0.78
Rev - 3.57

AX15 Manual 5 speed
1st 3.83
2nd 2.33
3rd 1.44
4th 1.00
5th 0.79
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Old 08-30-2011, 12:59 PM   #24
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53.359872 4.0 nv3550 4.88
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Old 08-30-2011, 01:27 PM   #25
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Tire size plays a large part in this as well?!?

NSG370 manual 2005-2012
Gear ratios:

1st 4.46
2nd 2.61
3rd 1.72
4th 1.25
5th 1.00
6th 0.84
rev 4.06
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Old 08-30-2011, 02:15 PM   #26
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Here is another great site for caluclations-
Novak Conversions - Gearing & Gearing Math for Jeeps

I wish I listened to Jerry B. and got the 4.88s now that I have my 35s 4.56s are barely cutting it...
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Old 08-30-2011, 02:40 PM   #27
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NSG370, 2.72 TC, 3.73 Axle
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Old 08-31-2011, 12:19 AM   #28
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55; but considering bumping gearing up to 4.10 from my current 3.07
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Old 08-31-2011, 09:25 AM   #29
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Originally Posted by CY99TJ View Post
Tire size plays a large part in this as well?!?
For sure tire diameter plays a huge roll. I have no idea why these calculators don't include tire size. Mine is 73.14, and it still feels fast sometimes, even with 31s. With 35s it would be real fast and i'd want 3-4 speed t-case.
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Old 08-31-2011, 05:56 PM   #30
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Quote:
Originally Posted by CY99TJ View Post
I'm at 4.01 X 2.72 X 4.56 = 49.7368
Me too. I'm curious how tire size plays into this.

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