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Old September 22nd, 2006, 08:33 AM   #1
Cooter
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Default Crawl Ratio Calculator

This is one of the better ones I have found, it is missing some trannys and tire sizes, but you can plug in what you want if it isn't listed.

Pretty good calculator that will show crawl ratio and speed @ 3K RPM Though I doubt your Jeep will actually be able to do 163 MpH @ 3K RpM with 44s and a NV3550 without some other modifications. :tonka:

Play around with it a little, and see what different trannys and crawl boxs can do for your crawl ratio- a crawlerbox will do much more for less coin than regearing axles, in many instances.

If you already know your gearing, use a calculator (Or Be a Man and figure it out in your head)

Or, even better- you can use Jesus 's Nifty Keen Excel Sheet that Cooter can't use due to being only computer literate enough to be able to say "I would like a chicken salad sandwich" and "where is the bathroom, I have a burning in my loins"
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Last edited by Cooter; September 22nd, 2006 at 10:40 AM.
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Old September 22nd, 2006, 08:53 AM   #2
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Quote:
Originally Posted by Cooter
If you already know your gearing, use a calculator (Or Be a Man and figure it out in your head)
Or use the excel sheet that I made when I was bored at work..

http://www.greatlakes4x4.com/showthread.php?t=4384
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Old September 22nd, 2006, 09:02 AM   #3
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There ya go- I looked around a little, and didn't see it. Do you mind if I add it to the original post here. (I have to take your word on it working, I'm not able to start the apllication)
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Old September 22nd, 2006, 09:04 AM   #4
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Go for it
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Old September 22nd, 2006, 09:04 AM   #5
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so no autos huh? Interesting that the people that should be most worried about crawl ratios are rigs that run rocks, yet a manual is a nightmare in the rocks, and the calc doesn't have info for autos
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Old September 22nd, 2006, 09:08 AM   #6
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which also brings up the age old question of what gear reduction do you assume for a torque converter?
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Old September 22nd, 2006, 09:08 AM   #7
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Yeah, I noticed the same thing, but you can plug in your slushbox's ratio- TF999 is 2.74, IIRC. The auto/manual thing is kinda aplles to oranges anyway, as far as crawl rtios go- you can get away with a lot less with an automatic because of the torque converter. And once you get to 90/1 or lower, a manual tranny is a pleasure on the rocks, IMO.
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Old September 22nd, 2006, 09:12 AM   #8
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Quote:
Originally Posted by Bones
which also brings up the age old question of what gear reduction do you assume for a torque converter?
2 to 1 is a real rough estimate, and it will change, depending on tranny, converter weight of the rig, tire size and construction, etc.. (You really don't want to know what converter I run in the Scrambler) There is also a ton more fudge factor in an automatic due to converter slip.
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Old September 22nd, 2006, 03:29 PM   #9
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Yeah, at that 2:1 factor is mainly only there below stall speed.


I'd agree with Cooter, once you are properly geared, a manual rocks the rocks.

In my truck I have overall final gears of:

100:1
59:1
44:1
37:1
26:1
25:1
22:1
19:1
16:1
12:1
11:1
9:1
7:1
5:1
4:1

At 100:1, even the wimpy 22RE idles up rocky steambeds with no bashing, no throttle needed. Downhill is slow enough that I'm on the gas to go downhill.
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Old September 23rd, 2006, 08:10 PM   #10
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Here is a good site that lists trans ratios if your not sure what yours is...

http://www.vibratesoftware.com/html_...nsmissions.htm
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Old August 20th, 2007, 08:33 AM   #11
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Here's another calculator:
http://www.grimmjeeper.com/gears.html
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Old August 11th, 2010, 08:03 PM   #12
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This one does autos as well as lots more and even lets you enter your own ratios if you have something tricky.
http://www.grimmjeeper.com/gears.html

Have fun
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