Post by: thetastelingers on January 30, 2019, 02:05:29 PM
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
Post by: Anvilsam on January 30, 2019, 02:18:52 PM
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.
Post by: bjeep on January 30, 2019, 02:37:51 PM
I don't see .5 of a point making much of a difference. [beer]
Post by: thetastelingers on January 30, 2019, 02:51:55 PM
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.
Quote
Gear Ratios for the AW4 are 2.80, 1.53, 1.00 & .75.
Post by: BigPrince on January 30, 2019, 03:28:32 PM
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.
Post by: Anvilsam on January 30, 2019, 08:23:44 PM
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.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.
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Post by: Michigunman on February 02, 2019, 10:35:01 AM
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.
Post by: jc79 on February 02, 2019, 10:58:43 AM
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.
Post by: tcdawg on February 02, 2019, 12:05:33 PM
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
Post by: Mortalis5509 on February 02, 2019, 01:42:46 PM
So depending on axle ratio, 3.8 would be perfect to use. That would allow for great versatility.
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Post by: Michigunman on February 02, 2019, 03:48:06 PM
Post by: DOUG on February 02, 2019, 06:53:35 PM
Thanks guys, great feedback!
2.72, 3.8, 10.34 are so close to your first choices I doubt you could tell the difference.
Post by: Michigunman on February 02, 2019, 09:17:38 PM
Good point Doug. I been over thinking it.Thanks guys, great feedback!
2.72, 3.8, 10.34 are so close to your first choices I doubt you could tell the difference.
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Post by: tcdawg on February 03, 2019, 08:46:27 PM
Good point Doug. I been over thinking it.Thanks guys, great feedback!
2.72, 3.8, 10.34 are so close to your first choices I doubt you could tell the difference.
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Easy to do. They are ‘spensive
Post by: thetastelingers on February 04, 2019, 07:31:38 AM
Now ya'll have me thinking about the 4 speed...
Post by: thetastelingers on March 28, 2019, 01:55:53 PM
2.72, 2.00, 5.44
Thinking the 2.00 would be good cruising up the trails in 2LO, 2.72 would be good just random crawling and 5.44 for the rough stuff.
Any opinions on this set-up good or bad?
Post by: Anvilsam on March 28, 2019, 02:04:02 PM
So... revisiting this, really thinking on the 4 speed meow.
2.72, 2.00, 5.44
Thinking the 2.00 would be good cruising up the trails in 2LO, 2.72 would be good just random crawling and 5.44 for the rough stuff.
Any opinions on this set-up good or bad?
i think i'd go a little lower on the 2.72. a 3.8 would be a good ratio or even a 3.0
Post by: kent10sne1 on March 28, 2019, 02:05:41 PM
Post by: patman on March 28, 2019, 02:18:08 PM
So... revisiting this, really thinking on the 4 speed meow.
2.72, 2.00, 5.44
Thinking the 2.00 would be good cruising up the trails in 2LO, 2.72 would be good just random crawling and 5.44 for the rough stuff.
Any opinions on this set-up good or bad?
i think i'd go a little lower on the 2.72. a 3.8 would be a good ratio or even a 3.0
Agreed.
My dana 300 is 2.62:1. With my manual trans having a 6.7:1 first, it works well, but if I had anything higher (like an auto) I'd want a lower tcase. I think 2.72 would leave you wanting more, and i would lean toward the 3.8 if I had a choice (FWIW, I will be going 4:1 in my case eventually)
Post by: thetastelingers on March 28, 2019, 03:29:32 PM
So... revisiting this, really thinking on the 4 speed meow.
2.72, 2.00, 5.44
Thinking the 2.00 would be good cruising up the trails in 2LO, 2.72 would be good just random crawling and 5.44 for the rough stuff.
Any opinions on this set-up good or bad?
i think i'd go a little lower on the 2.72. a 3.8 would be a good ratio or even a 3.0
Ah. So just use the reduction OR the box and not worry about using them both?
Post by: Quarterpastgone on March 28, 2019, 03:30:21 PM
Post by: kvom on March 28, 2019, 04:33:27 PM
Crawl ratio that includes transmission and axle gearing can help decide transfer case gearing. If 11.7 is too low you can always shift into 2nd.
Post by: TrevorG on March 28, 2019, 05:18:09 PM
That being said....my vote would be for the 3.8 for the options. Gotta make sure you have a gear for wheel speed around here.Sent from my iPhone using Tapatalk
Post by: thetastelingers on April 01, 2019, 08:31:59 AM
Still going back and forth with the 4 and the 2.
After this weekend, I may end up with just the 2. Still undecided though.
Post by: lt99ls1 on April 01, 2019, 09:08:46 AM
Post by: TravisMac on April 01, 2019, 09:58:20 AM
Post by: Anvilsam on April 01, 2019, 10:04:42 AM
Post by: ILOVEDIRT on April 01, 2019, 02:20:50 PM
Post by: kvom on April 01, 2019, 04:40:43 PM
Post by: tcdawg on April 01, 2019, 07:09:59 PM
6.0 w 6L80 trans
5.38 axles gearing
1:1, 2.7:1, 3.8:1 and 10:1
I really like the 3.8 : 1. Real good crawl but can still generate some wheel speed if necessary.