Atlas T-case questions

[thetastelingers]

I had an Atlas II in my previous TJ. 4.88 gears and 35s. The Atlas was a 3.8:1. I thought it was a good crawling ratio.  (the TJ was a manual transmission)

My current Jeep (Cherokee) has 5.13s and 37s.  Was leaning towards going with the 3.8:1 again. (automatic tranny in this one)

I'll be ordering one in the close future and wanted to see what everyone thought.

Opinions, anyone went too low 4.3:1 and disliked it?

Thanks

[Anvilsam]

I had an Atlas II in my previous TJ. 4.88 gears and 35s. The Atlas was a 3.8:1. I thought it was a good crawling ratio.  (the TJ was a manual transmission)

My current Jeep (Cherokee) has 5.13s and 37s.  Was leaning towards going with the 3.8:1 again. (automatic tranny in this one)

I'll be ordering one in the close future and wanted to see what everyone thought.

Opinions, anyone went too low 4.3:1 and disliked it?

Thanks

I have the 4.3:1 and its a little low for me with 5.38 gearing. On the new axles i went with 4.88 to try and help this a little. Whats your first gear transmission ratio? Mine is pretty low and the stupid jk computer wont let me start in anything but 1st or 2nd.

[bjeep]

I have a 4.3 in mine and I like it. But I do have 4.10 in the axles. I got such a deal in mine it did not matter what the ratio was.
 I don't see .5 of a point making much of a difference.

[thetastelingers]

I had an Atlas II in my previous TJ. 4.88 gears and 35s. The Atlas was a 3.8:1. I thought it was a good crawling ratio.  (the TJ was a manual transmission)

My current Jeep (Cherokee) has 5.13s and 37s.  Was leaning towards going with the 3.8:1 again. (automatic tranny in this one)

I'll be ordering one in the close future and wanted to see what everyone thought.

Opinions, anyone went too low 4.3:1 and disliked it?

Thanks

I have the 4.3:1 and its a little low for me with 5.38 gearing. On the new axles i went with 4.88 to try and help this a little. Whats your first gear transmission ratio? Mine is pretty low and the stupid jk computer wont let me start in anything but 1st or 2nd.

Had to look up the ratios.

Gear Ratios for the AW4 are 2.80, 1.53, 1.00 & .75.

[BigPrince]

I had an Atlas II in my previous TJ. 4.88 gears and 35s. The Atlas was a 3.8:1. I thought it was a good crawling ratio.  (the TJ was a manual transmission)

My current Jeep (Cherokee) has 5.13s and 37s.  Was leaning towards going with the 3.8:1 again. (automatic tranny in this one)

I'll be ordering one in the close future and wanted to see what everyone thought.

Opinions, anyone went too low 4.3:1 and disliked it?

Thanks

I have the 4.3:1 and its a little low for me with 5.38 gearing. On the new axles i went with 4.88 to try and help this a little. Whats your first gear transmission ratio? Mine is pretty low and the stupid jk computer wont let me start in anything but 1st or 2nd.

Your ratios are going to be way different than the last engine/trans setup.  I've seen folks with 3:1 Atlas's on LS swaps.  When I looked at v8 swaps I've always included axle regear and atlas change in my cost estimates.

[Anvilsam]

I had an Atlas II in my previous TJ. 4.88 gears and 35s. The Atlas was a 3.8:1. I thought it was a good crawling ratio.  (the TJ was a manual transmission)

My current Jeep (Cherokee) has 5.13s and 37s.  Was leaning towards going with the 3.8:1 again. (automatic tranny in this one)

I'll be ordering one in the close future and wanted to see what everyone thought.

Opinions, anyone went too low 4.3:1 and disliked it?

Thanks

I have the 4.3:1 and its a little low for me with 5.38 gearing. On the new axles i went with 4.88 to try and help this a little. Whats your first gear transmission ratio? Mine is pretty low and the stupid jk computer wont let me start in anything but 1st or 2nd.

Your ratios are going to be way different than the last engine/trans setup.  I've seen folks with 3:1 Atlas's on LS swaps.  When I looked at v8 swaps I've always included axle regear and atlas change in my cost estimates.

Not as big of a deal with the regular 6.4 swap since you use the same tranny but with just a few mods and a good tune it becomes a lot more apparent that changes were needed.


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[Michigunman]

Don't mean to hijack your thread but I have been struggling with a similar decision so figured I'd just chime in here. 

I have been planning on a 4 speed Atlas for a while now.  My intent has always been to go with the 2.72, 4.3, 11.7 (what Clark has) with the 11.7 being kind of a throw away.  This way I keep my current 2.72 and add the 4.3.  Well AA no longer makes that combination.  They said the 11.7 was just too low and was causing failures.

So now i'm left with either the 2.72, 3.8, 10.34 or the 2.0, 2.72, 5.44.  Neither one of these seems ideal for my automatic transmission.  3.8 seems not low enough and 5.44 seems too low.

[jc79]

Don't mean to hijack your thread but I have been struggling with a similar decision so figured I'd just chime in here. 

I have been planning on a 4 speed Atlas for a while now.  My intent has always been to go with the 2.72, 4.3, 11.7 (what Clark has) with the 11.7 being kind of a throw away.  This way I keep my current 2.72 and add the 4.3.  Well AA no longer makes that combination.  They said the 11.7 was just too low and was causing failures.

So now i'm left with either the 2.72, 3.8, 10.34 or the 2.0, 2.72, 5.44.  Neither one of these seems ideal for my automatic transmission.  3.8 seems not low enough and 5.44 seems too low.

Mark, I've got the 4-speed 3.8 and its awesome.  I also have an auto in the LJ.  3.8 has never seemed "not low enough" to me.  And in cases where you need lower, the 10.34 is very useable.  I wouldn't say I use it all that often, because 3.8 has been fine for most stuff.  But on really technical stuff (going up or down) I really like having it... the control is amazing.

[tcdawg]

Don't mean to hijack your thread but I have been struggling with a similar decision so figured I'd just chime in here. 

I have been planning on a 4 speed Atlas for a while now.  My intent has always been to go with the 2.72, 4.3, 11.7 (what Clark has) with the 11.7 being kind of a throw away.  This way I keep my current 2.72 and add the 4.3.  Well AA no longer makes that combination.  They said the 11.7 was just too low and was causing failures.

So now i'm left with either the 2.72, 3.8, 10.34 or the 2.0, 2.72, 5.44.  Neither one of these seems ideal for my automatic transmission.  3.8 seems not low enough and 5.44 seems too low.

Mark, I've got the 4-speed 3.8 and its awesome.  I also have an auto in the LJ.  3.8 has never seemed "not low enough" to me.  And in cases where you need lower, the 10.34 is very useable.  I wouldn't say I use it all that often, because 3.8 has been fine for most stuff.  But on really technical stuff (going up or down) I really like having it... the control is amazing.

Same here.  I have the 4 speed w the same ratios as Jared.  I like the 3.8:1, it’s my go to low gear. The 10.1 is pretty darn low but it definitely has its uses.  Steep nasty down hills are one spot I’ve used 10.1

[Mortalis5509]

On the I6 in my tj with 5.13 gears and 4:1 t-case, unless it's really slow crawling I had to use second to generate wheel speed in the auto.

So depending on axle ratio, 3.8 would be perfect to use. That would allow for great versatility.

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[Michigunman]

Thanks guys, great feedback!

[DOUG]

Thanks guys, great feedback!

2.72, 3.8, 10.34 are so close to your first choices I doubt you could tell the difference.