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post #1 of 16 Old 09-29-2008, 05:20 PM Thread Starter
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Atlas Four Speed

Got home on Friday to find two large boxes sitting on the porch! I ordered the 1:1, 2:1, 2.72:1 and 5.44:1 setup with the electric low switch.. Scheduled install date: The week of 11/23. I'd take pictures now, but who wants to see a couple of boxes?

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post #2 of 16 Old 09-29-2008, 05:38 PM
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Awesome! Not many people have put an atlas in the JK yet, looking forward to seeing it installed.

Jason
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post #3 of 16 Old 09-30-2008, 07:36 AM
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Very nice
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post #4 of 16 Old 09-30-2008, 08:02 AM
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i've never understood why they chose the gear ratios for their 4-speeds the way they did.

the 2.1:1 and 2.72:1 are too close together. if you go with the other model, the 10.xx is waaaayyy too low.

if they'd make one with a 2:1, 4:1 and 5.44:1, i'd buy it.
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post #5 of 16 Old 09-30-2008, 08:04 AM
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post #6 of 16 Old 09-30-2008, 08:36 AM
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[quote=mcnaught6;40917]the 2.1:1 and 2.72:1 are too close together.[/quote[X2

Quote:
if you go with the other model, the 10.xx is waaaayyy too low.
I'd like 10:1, wouldn't use it often but would be nice to have.
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post #7 of 16 Old 09-30-2008, 08:54 AM
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no doubt some would use the 10:1. i just wouldn't think that it would be useful to very many.
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post #8 of 16 Old 09-30-2008, 09:04 AM
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I have 6.5-1 in my Samurai. Being that low is awesome. 10-1 would be even better. I'm holding out for the crawl box for the auto to come out.

DO NOT DO BUSINESS WITH SHAFFERS OFFROAD. YOU WILL BE SORRY YOU DID..
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post #9 of 16 Old 09-30-2008, 09:16 AM
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Their 4 speed case is two units stacked together, a 2 speed case with a 2.72:1 reduction unit. You can get a 2 speed case with either a 2:1 or a 3.8:1 and then with the 2.72:1 reduction unit you end up with either 1:1, 2.0:1, 2.7:1 & 5.4:1 or with 1.1, 2.7:1, 3.8:1 & 10.3:1. That is why they have those gear ratio combinations.

If you have a RLE42 transmission, Advanced Adapters will offer the RubiCrawler this spring. It is a 2.72:1 reduction unit to replace the tail shaft of the transmission. With that unit, I would have 1:1, 2.72:1, 4:1 & 10.88:1.

https://www.jkowners.com/forum/showthread.php?p=27550

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Originally Posted by mcnaught6 View Post
i've never understood why they chose the gear ratios for their 4-speeds the way they did.
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post #10 of 16 Old 09-30-2008, 09:16 AM
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I'd love to have a 10:1 for the rocks.

Jason
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post #11 of 16 Old 09-30-2008, 09:41 AM
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I can remember two times last spring in Moab that I would have used 10:1. And I know I would use 2.7:1, if I had it.
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post #12 of 16 Old 09-30-2008, 09:53 AM
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Quote:
Originally Posted by n8it View Post
Their 4 speed case is two units stacked together, a 2 speed case with a 2.72:1 reduction unit. You can get a 2 speed case with either a 2:1 or a 3.8:1 and then with the 2.72:1 reduction unit you end up with either 1:1, 2.0:1, 2.7:1 & 5.4:1 or with 1.1, 2.7:1, 3.8:1 & 10.3:1. That is why they have those gear ratio combinations.

If you have a RLE42 transmission, Advanced Adapters will offer the RubiCrawler this spring. It is a 2.72:1 reduction unit to replace the tail shaft of the transmission. With that unit, I would have 1:1, 2.72:1, 4:1 & 10.88:1.

https://www.jkowners.com/forum/showthread.php?p=27550
exactly


the 2.72:1 reduction unit on the 4 speed is basically, if not exactly, the same thing that the "RubiCrawler" is.

To get the "RubiCrawler", AA basically took the front reduction unit off of the 4-speed and is using it to go in front of the NV241OR as the tailhousing of the tranny
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post #13 of 16 Old 09-30-2008, 10:10 AM
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Quote:
Originally Posted by n8it View Post
If you have a RLE42 transmission, Advanced Adapters will offer the RubiCrawler this spring.
I think a few people are anxiously awaiting the RubiCrawler, I know I am.
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post #14 of 16 Old 09-30-2008, 10:15 AM Thread Starter
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Quote:
Originally Posted by paragon View Post
exactly


the 2.72:1 reduction unit on the 4 speed is basically, if not exactly, the same thing that the "RubiCrawler" is.

To get the "RubiCrawler", AA basically took the front reduction unit off of the 4-speed and is using it to go in front of the NV241OR as the tailhousing of the tranny
It's also the basic gear ratio for the Sahara and X. I use it a lot and really like it. However, there are times when I need something lower for both rocks and steep declines. I don't think I'd ever use a 10:1, but I'm thinking the 2:1 could be pretty handy in 2wd snow conditions. That's why I went that route. If bad comes to worse, I can always put in the Rubicrawler as well. Think of all the levers and buttons for that setup...

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post #15 of 16 Old 09-30-2008, 10:44 AM
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Quote:
Originally Posted by seer View Post
It's also the basic gear ratio for the Sahara and X. I use it a lot and really like it. However, there are times when I need something lower for both rocks and steep declines. I don't think I'd ever use a 10:1, but I'm thinking the 2:1 could be pretty handy in 2wd snow conditions. That's why I went that route. If bad comes to worse, I can always put in the Rubicrawler as well. Think of all the levers and buttons for that setup...
You already have the "Rubicrawler", it's part of the 4speed setup.

the 4-speed has the little doubler on the input just like the "Rubicrawler" would add as a doubler to the input of the stock t-case
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post #16 of 16 Old 10-05-2008, 09:59 AM Thread Starter
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Here's a little tease for ya'll.

49 days until install.

BEER Helping me do stupid things to my JK since 2007!
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