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Unread 12-08-2013, 10:57 AM   #1
David_M
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Atlas II in a '13 JKU Sport

Looking for opinions, and have a question or two about Atlas transfer case upgrade. I have a '13 JKU sport, I have been searching for a rubicon 4:1 transfer case to swap since I bought this jeep new one year ago. I have found a couple but they all wanted what I consider to be a kings ransom, $1,500 or more plus shipping. I absolutely refuse to pay that for a stock rubicon transfer case. The earlier models can be found for a much more reasonable price. Since I have a 5 speed auto transmission only '12-'14 year models will work. I have priced them new from the dealer with warranty for around $1,800.

My frustrations have led me to pursue other options. I was looking at advanced adaptors website and it appears I can get a Atlas II with a 4.3:1 low range ratio with cable shifter, speedometer sensor, yokes, etc for around $2500. It is definitely more than I originally planned to spend but I would rather pay that for an Atlas than $1800 for a stock rubicon case. Honestly, I'd even consider a Atlas 4 speed if it could be done with the automatics. According to Advanced Adaptors web site the computer on the 2012 - '14 year models can only compensate for a single low range gear ratio not multiples that would be used with a 4 speed transfer case.

So my question is being that the Atlas cases are gear driven instead of chain driven is there a noticable increase in noise under normal driving conditions? Any other options I have not considered?

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Unread 12-08-2013, 11:04 AM   #2
SoK66
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Quote:
Originally Posted by David_M View Post
Looking for opinions, and have a question or two about Atlas transfer case upgrade. I have a '13 JKU sport, I have been searching for a rubicon 4:1 transfer case to swap since I bought this jeep new one year ago. I have found a couple but they all wanted what I consider to be a kings ransom, $1,500 or more plus shipping. I absolutely refuse to pay that for a stock rubicon transfer case. The earlier models can be found for a much more reasonable price. Since I have a 5 speed auto transmission only '12-'14 year models will work. I have priced them new from the dealer with warranty for around $1,800.

My frustrations have led me to pursue other options. I was looking at advanced adaptors website and it appears I can get a Atlas II with a 4.3:1 low range ratio with cable shifter, speedometer sensor, yokes, etc for around $2500. It is definitely more than I originally planned to spend but I would rather pay that for an Atlas than $1800 for a stock rubicon case. Honestly, I'd even consider a Atlas 4 speed if it could be done with the automatics. According to Advanced Adaptors web site the computer on the 2012 - '14 year models can only compensate for a single low range gear ratio not multiples that would be used with a 4 speed transfer case.

So my question is being that the Atlas cases are gear driven instead of chain driven is there a noticable increase in noise under normal driving conditions? Any other options I have not considered?
First up, the Rubi 4:1 is an excellent, robust box, and it will likely be and easier swap than the Atlas. That being said, if I ever have a fail with mine the next box going in will be an Atlas II. I had an Atlas II 3.8:1 in my last rig and it was probably the best upgrade of any I did on that Jeep. AA makes a great product, with excellent support. Being gear driven they do make more noise than the chain driven boxes, no doubt. However, the newer ones use shift cables rather than rods like I had and I'm told that reduces the noise considerably.

Lastly, I'd be cautious about going 4.3:1, that's a really low reduction. A 3.8:1 should be plenty with a manual trans.
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Unread 12-08-2013, 11:19 AM   #3
David_M
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Quote:
Originally Posted by SoK66 View Post
First up, the Rubi 4:1 is an excellent, robust box, and it will likely be and easier swap than the Atlas. That being said, if I ever have a fail with mine the next box going in will be an Atlas II. I had an Atlas II 3.8:1 in my last rig and it was probably the best upgrade of any I did on that Jeep. AA makes a great product, with excellent support. Being gear driven they do make more noise than the chain driven boxes, no doubt. However, the newer ones use shift cables rather than rods like I had and I'm told that reduces the noise considerably.

Lastly, I'd be cautious about going 4.3:1, that's a really low reduction. A 3.8:1 should be plenty with a manual trans.
Thanks for the feedback. I appreciate your input. Let me re-iterate that a rubicon case was and is my first option. At this point with the prices I'm finding it just doesn't make a lot of sense when for $800 more I can have a Atlas. Not only a more robust unit which will undoubtedly carry its resale value. Also, have the ability to do front digs is a plus. I'll be the first to admit that a front dig isn't called for often, matter of fact it is rare. But, in my experience when its needed, its needed and there isn't another way.

Regarding your concerns with the low range gear ratio. I do have a automatic not a standard. Is your concern with the 4.3:1 ratio pushing through the brakes or what?

On a side note: I see your from Durango, CO. Any plans of attending the All for fun event in Silverton, CO this summer. My family and I might pack up the JK and head up there in late July.

Thanks, David M
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Unread 12-08-2013, 05:08 PM   #4
SoK66
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Quote:
Originally Posted by David_M
Thanks for the feedback. I appreciate your input. Let me re-iterate that a rubicon case was and is my first option. At this point with the prices I'm finding it just doesn't make a lot of sense when for $800 more I can have a Atlas. Not only a more robust unit which will undoubtedly carry its resale value. Also, have the ability to do front digs is a plus. I'll be the first to admit that a front dig isn't called for often, matter of fact it is rare. But, in my experience when its needed, its needed and there isn't another way. Regarding your concerns with the low range gear ratio. I do have a automatic not a standard. Is your concern with the 4.3:1 ratio pushing through the brakes or what? On a side note: I see your from Durango, CO. Any plans of attending the All for fun event in Silverton, CO this summer. My family and I might pack up the JK and head up there in late July. Thanks, David M
I just got elected Pres. of our, local club, so I'll no doubt be at All 4 Fun. You'll find yourself rowing in & out of 4lo a lot with a 4.3 and the ratio isn't that much of an advantage over the. 3.8. Sorry, I misunderstood your earlier post re the trans. I had a manual in my old YJ and the 3.8 was the bomb.
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