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Old December 9th, 2009, 06:56 PM   #1
Kodiak450r
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Default atlas t-cases review

anyone running an atlas 2 or 4 speed? how do you like it, worth the money? seen that the 4 speeds are out and available and wanna see some real world results before i go adding it to my wish list. i would be getting the 4 speed with 10.3:1 low gear version. with my early NV4500, atlas 4 speed, and 4.10 gearing with 37's i would have a 269:1 crawl ratio. capable of 27 feet per minute. granted i'm not building a crawler but finesse is sometimes greater then brute force when going over obstacles.
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Old December 9th, 2009, 06:58 PM   #2
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lots of people run them. they who own them would never change to anything else from everyone i have talked to.

search for it on pirate. they are will known with no problems
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Old December 9th, 2009, 07:14 PM   #3
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your gearing is useless....

before you go compiling a wish list, at least make sure the parts will get you a good end result. anything higher than 150:1 crawl ratio is not usable with a small under powered engine and anything higher than 100:1 with 200+ hp is useless.

I have a th400, 3.8 2 speed 4.88's and 37's holding some concrete down very well. I already have plans to swap to a 4l60 to 5.4 4 speed and 5.40's. First gear in low range will be just about useless and that's not even super low gearing.

Atlas>Stak because there are a lot of odd random issues that show up for no apparent reason with stak cases.
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Old December 9th, 2009, 07:19 PM   #4
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Quote:
Originally Posted by 95geo View Post
your gearing is useless....

before you go compiling a wish list, at least make sure the parts will get you a good end result. anything higher than 150:1 crawl ratio is not usable with a small under powered engine and anything higher than 100:1 with 200+ hp is useless.

I have a th400, 3.8 2 speed 4.88's and 37's holding some concrete down very well. I already have plans to swap to a 4l60 to 5.4 4 speed and 5.40's. First gear in low range will be just about useless and that's not even super low gearing.

Atlas>Stak because there are a lot of odd random issues that show up for no apparent reason with stak cases.
maybe i want a truck that can idle up a vertical wall. i'd rather have it and not need it then need it and not have it.
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Old December 9th, 2009, 08:28 PM   #5
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Once you get some time under your belt while out wheeling you will realise that a 10:1 t-case is retarted for anything but bragging about your crawl ratio which would be circa 1998... Quite honestly, 5.4:1 is too much for anything but a zuk or a toyota, even then it's on the edge.

If I were starting over and I didnt want a 500hp V8 I would build around a turbo ecotec massaged to 300-350hp, to a 4L60 to a 4 speed 5.4:1 atlas. That would be a wicked powertrain combo and still nice and compact.
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Old December 9th, 2009, 10:12 PM   #6
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I had a tera-low 4to1 with an aw4 in my tj. It was just about too low and was definately too low for anything besides crawling. I over-reved (not hard) and it and it went boom. I went with a 2sp atlas in the 3.8 range. I thought 4.3 would be too low and the slightly higher gear would be better for sand and mud. I also put in a manual shifter for my auto that I can lock in whatever gear I want. That lets me achieve almost any range I would want by locking my tranny in the gear needed. I rock crawl in first or second (first is sometimes too low still) and while at the dunes I can lock it into third or fourth and be in a good range for some wheel speed. I have a fairly stock 4.0 liter but with the 4sp aw4 tranny. I wouldn't change anything. Advanced adapters is one of the best companies I've ever dealt with as far as customer service goes too. Also, if you want to spend the extra grand and get a 4sp I would recommend the other ratio box. I think its 2.0,2.72,5.44. That would give you great range for sand, mud, rock, whatever.
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Old December 9th, 2009, 10:35 PM   #7
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I have the Stak 3 speed mini box....I really like it
I run a stock 4.0L with a AX15 trans and 4.88 gears on 35" tires (for now). Low Low crawl ratio right at 100 to 1. Works just fine but I have had a few times a slightly slower crawl might have been nice, not really needed though. But that will all change when I put my NV4500 in, then I will be around the 150 range.
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Old December 9th, 2009, 10:49 PM   #8
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my toyota with dual 2.7 cases, 4.56's and 37's crawls nice and slow and gives me some torque that the stock 20r is lacking but if you have any more power you dont need to go that slow. it is nice though to be able to just start it in gear and not even realize it.
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Old December 10th, 2009, 08:51 AM   #9
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Quote:
Originally Posted by Kodiak450r View Post
i'd rather have it and not need it then need it and not have it.
It isn't one of those things that fits that logic.
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Old December 10th, 2009, 10:54 AM   #10
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In my TJ that is holding down my trailer I have a stock 4.0, AX-15 trans, 5.4:1 Atlas 4 speed, 4:88's cogs and 39" tires. I dont believe in crawl ratios but feel this combo will be pretty ok for most wheeling situations Ill end up in. I ended up running the 4 speed cause I came across one for a hell of a deal. I was going to run a flipped D-300 and a Northwest fab Black box. However in the end it was only a few hundred difference between the 2 setups and Atlas has a far superior track record over other T-cases; ie Stak.

I have a friend who has the 10:1 atlas 4 speed in his TJ (at the time had a 4.0/ax-15/10:1 atlas and i think 4:88's) and it was RETARDED SLOW!!! I mean at a Pig Gig a few years back after putting it in low low Kirby ran out of his Jeep, ran 20ft to a bathroom, left the bathroom about a minute later and the Jeep moved maybe 10ft if that.
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Old December 11th, 2009, 05:22 PM   #11
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well everyone saying how good the atlas and there service is thats what i was looking for. it'll be awhile before i can shell out 3000 for a t-case like that. for now i'll run the NV4500 paired to the NP241 it came with. once i get my blazer SAS'ed and up on 37's well see how it does first.
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