I'm ordering a Atlas for the Jeep however I can't decide on which gear option I should order.

I have to keep the price below $2500 and want the 32 spline upgrade with a CV drive. The price for the 4:3 with the 32 spline upgrade is about the same as the 5:1. I have a TJ with d44's and 5:13's running on 37's and really only like to run the rocks and trailrides and do drive the jeep on the street often.

What would you guys order? is the 5:1 going to be to low? I know some think that's not possible.ha.


Any help would be great thanks a lot guys.

(if this is not hard core I'm sorry for that I ill remove it)

Jeremy

Which trans? With an AX15 I would go for the 5:1. A slushbox should be more than adequate with the 4.3:1.

Either way, with a 4cyl I would go stack 3spd, atlas 4spd or 6:1.

Sorry about that, I have the I-6 with the AX-15.

Thats one for the 5:1

Jeremy

Given your drivetrain and the type of terrian you run Id get the 5.1 also. A friend of mine has a smiliar setup bit larger tire and 5.38s but he runs the 5.1 on rocks and loves it, so thats two for the 5.1.:p

I will give my vote for the 5:1 as well. I currently have the Tera low 4:1 w/ the AX-15 & I6 ~ I sure could use a little more sometimes on the big rocks. Then again it is a double edge sword, when I play at the dunes/hill climbs the 4:1 is too low and I wish I had the 2.72:1 back. My plan is to turn my current NP231 (w/ 4:1) into a reduction box and put it front of an Atlas 3:1 that way I can have the best of both worlds.

Mike

My wife has the 5:1, AX-15, 4.10's and 37's, putting her at almost 78:1. It's livable but we would both like i to be lower for crawling. We're swapping out the 30 this winter and putting a HP44 with 5.13's, putting her in the 97:1 range which should be just about perfect in my opinion esp if you do lots of rock crawling. My old YJ was at 132:1 with an NV4500, dana 300 w/4:1 and 5.89's on 40" TSL's, that felt great with a 6cyl. Wouldn't want much lower than that, but did a great job on the big boulders

Another vote for the 5to1. If you are not into mud or sand the low gearing for rocks is great and with the OD you can still move good in low range on easy trails.

My wife has the 5:1, AX-15, 4.10's and 37's, putting her at almost 78:1. It's livable but we would both like i to be lower for crawling. We're swapping out the 30 this winter and putting a HP44 with 5.13's, putting her in the 97:1 range which should be just about perfect in my opinion esp if you do lots of rock crawling. My old YJ was at 132:1 with an NV4500, dana 300 w/4:1 and 5.89's on 40" TSL's, that felt great with a 6cyl. Wouldn't want much lower than that, but did a great job on the big boulders


I would say that also.

i have a 401 with d300 4:1 and a t-18 4.56's on 35's and its plenty low, ive run lower rigs and i even thought about putting a 5:1 in mine when my tera's grenaded but then i did three back to back trips and remembered just about how spot on the 4:1 is for 95% of what i do. Ive done a 231/d300 doubler but with a v8 it was too low for me. im at 115:1 there are spots where i can crawl or in 1st gear i still have enough wiggle room to give it a little throttle and actually go somewhere, with my doubler years ago i used to constantly find that i was too low when it was engaged to be able to use the engine at all. Was on rubicon with a couple of guys about a month ago one of them had a 6:1 case with a zf 5 spd and with my setup i was able to idle down and use the brake pedal to slow things right down to what he was able to do with his 302 zf & 6:1 but when things got tight i could tap out on the throttle like crossing fordyce with a rig in tow, where as he was not able to use wheel speed in that same situation and found himself in a more precarious one.


with the ax15 id look at the 5:1 but if you plan on a nv4500 id think again about the 4.3:1 but tire size and rear end ratio make a huge difference in that choice. if i was running 37's id be running the 5:1 no questions asked but id be upgrading to d60s no way a 44 could take a 401 with any more gear reduction and larger tires or 38's or larger and d60s then id be a 6:1

Sorry about that, I have the I-6 with the AX-15.

That's what I have; along with 4.56's and 35's. I am in the process of installing a 4.3 Atlas. I had a 4.0 Tera Low and often found that I had trouble keeping up with the pack on trail rides due to the input RPM limit on the Tera Low. The Atlas does not have that RPM limit, so I think I'll be OK with the 4.3, but I will be winding the motor up some. I thought the 5.0 would be great in the rocks, but too low for trail riding...at least for me.

I thought Atlas had the 5.0 on sale for $1,800 or something like that just a few weeks ago???

One other thing, the Atlas instructions said to allow 6-8 hrs for the install. Bull Shit. You will have to modify you tanny mount and your skid plate (hope you have a welder). You will also spend some hours dicking around with the shifters to get them right. You will also likely have to modify or buy new, two drive shafts. If you have a 1" BL, you should be able to clock it around to the last hole without any problems (7 degrees). If you have any questions, PM me.

Good Luck,
NIB

Id go as deep as you can, you can always upshift. I am at 204:1, wide ratio NV4500, 5.38s, 6:1. I have never said, gee this thing is too slow.

Sorry about that, I have the I-6 with the AX-15.


I would definitely go 5:1 with that drive-train.

Ill throw my turds out there:

97 TJ 4.0L Ax-15 Atlas4-20 (2.0-2.72-5.44) I like it because of the optional ratios for all around beating (the 4.0L isnt exactly full of HP). its got approx 40K on it now. (with the brakes on the floor in double low first it will turn over the rear tires @ an idle.
Ive had the Atlas4-38 in there before and prefer it over the Atlas4-20. just because of the wider ratios.

04' Bacon 4.0L 42RLE Auto (the girlfriends)
Atlas4.3/1 This works out preety good although sometimes I wish it were lower as being fullbodied it allows room for error and time to do something about it.
Let the auto do its thing and run it through its gears the rest of the trail.

The 4.3 are on sale for $1995.00 including the 32 spline front output, Yokes, shifter. (minus cable or flanges)

Running 4.0, ax-15, and the 4.3:1 Atlas and wish I went with the 5.0:1 every time I take the Jeep out.


edit for reference: tires are 39.5's and 5.13's

Running 4.0, ax-15, and the 4.3:1 Atlas and wish I went with the 5.0:1 every time I take the Jeep out.




Bah. Years ago your bosses convinced me to go with a tera low. Cry me a river. Want to trade?




:flipoff2:

Bah. Years ago your bosses convinced me to go with a tera low. Cry me a river. Want to trade?




:flipoff2:


Whenever you want to fix that let me know.
:flipoff2:

Bah. Years ago your bosses convinced me to go with a tera low. Cry me a river. Want to trade?

:flipoff2:

I think I would have to respectively decline that offer. Thanks anyway. :flipoff2:

Well guys like I thought it looks like the 5:1 is going to be the winner.

thanks for your help

jeremy

What about using a 2 speed stak.

That's what I have; along with 4.56's and 35's. I am in the process of installing a 4.3 Atlas. I had a 4.0 Tera Low and often found that I had trouble keeping up with the pack on trail rides due to the input RPM limit on the Tera Low. The Atlas does not have that RPM limit, so I think I'll be OK with the 4.3, but I will be winding the motor up some. I thought the 5.0 would be great in the rocks, but too low for trail riding...at least for me.

I thought Atlas had the 5.0 on sale for $1,800 or something like that just a few weeks ago???

One other thing, the Atlas instructions said to allow 6-8 hrs for the install. Bull Shit. You will have to modify you tanny mount and your skid plate (hope you have a welder). You will also spend some hours dicking around with the shifters to get them right. You will also likely have to modify or buy new, two drive shafts. If you have a 1" BL, you should be able to clock it around to the last hole without any problems (7 degrees). If you have any questions, PM me.

Good Luck,
NIB

Why would I need a welder? for the Transmission mount? (i have one if i need it)

I'm not worried about it taking awhile, I don't have a body lift and don't want to put one on either, I'm running the RE skid plate and was planning on cutting the floor board to make it fit. Do you think this will work?

I moved the wheelbase back to 102" and should have enough room in the drive shaft for everything to fit???

Thanks for all the help guys.

Jeremy

I would say that also.

i have a 401 with d300 4:1 and a t-18 4.56's on 35's and its plenty low, ive run lower rigs and i even thought about putting a 5:1 in mine when my tera's grenaded but then i did three back to back trips and remembered just about how spot on the 4:1 is for 95% of what i do. Ive done a 231/d300 doubler but with a v8 it was too low for me. im at 115:1 there are spots where i can crawl or in 1st gear i still have enough wiggle room to give it a little throttle and actually go somewhere, with my doubler years ago i used to constantly find that i was too low when it was engaged to be able to use the engine at all. Was on rubicon with a couple of guys about a month ago one of them had a 6:1 case with a zf 5 spd and with my setup i was able to idle down and use the brake pedal to slow things right down to what he was able to do with his 302 zf & 6:1 but when things got tight i could tap out on the throttle like crossing fordyce with a rig in tow, where as he was not able to use wheel speed in that same situation and found himself in a more precarious one.


with the ax15 id look at the 5:1 but if you plan on a nv4500 id think again about the 4.3:1 but tire size and rear end ratio make a huge difference in that choice. if i was running 37's id be running the 5:1 no questions asked but id be upgrading to d60s no way a 44 could take a 401 with any more gear reduction and larger tires or 38's or larger and d60s then id be a 6:1

Wow your jeep is low.

By the way I forgot how find my overall gear ratio?

Trans+axle gear+TC divid by 3= overall gear ratio????

I don't know I forgot.

Jeremy

http://www.atlas-tc.com/install/tj3.html

See the above instructions from AA. The problem is that you will not be able to reuse the oem AX-15 tranny mount. The rear of the mount will contact the Atlas at any clocking angle. You will have to cut the tranny mount in half and move the rubber piece forward about 6". If your RE skid already has mounting holes for this location, you will be good to go. The factory skid did not.

Brad

I'm all for low gearing. Just not too low, or you will have no top end I run a 258, 6.32 T-18, 4.10 gears and a 4:1 Dana 300, so I'm at about 106:1. I love it. I can't stall it out in first gear, go with whatever nets you close to 100:1 crawl

I had a 4.0 Tera Low and often found that I had trouble keeping up with the pack on trail rides due to the input RPM limit on the Tera Low.


Ha-ha. Do people actually go by that? Speed is only limited in low by rpm in 5th.

In all seriousness did something change? When I got mine there was no rpm limit, and I have been winding that bitch out for 8 years. All the newbs complain about this, but it seems to be a non issue.

Ha-ha. Do people actually go by that? Speed is only limited in low by rpm in 5th.

In all seriousness did something change? When I got mine there was no rpm limit, and I have been winding that bitch out for 8 years. All the newbs complain about this, but it seems to be a non issue.

I forgot about the RPM limit the first minute on the trial! My Tera Low has seen the rev limiter in almost every gear! I have abused mine for about 5 yrs now with no issues.

I forgot about the RPM limit the first minute on the trial! My Tera Low has seen the rev limiter in almost every gear! I have abused mine for about 5 yrs now with no issues.

Exactly what I am talking about. This new limit came up after mine was in. If there was a problem, mine would have broken. Aside from a very loud whine, and a front output leak, mine has been trouble free.

In all seriousness did something change? When I got mine there was no rpm limit, and I have been winding that bitch out for 8 years. All the newbs complain about this, but it seems to be a non issue.
Don't know if Teraflex changed it or not. All I know is it was in the instructions that came with mine 3 years ago and everyone Teraflex has shipped since then. I get the impression that the early Tera Lows may have been built better than the newer ones.

I babied that thing and it still went south. But, I ain't gonna bitch too much; Teraflex warrantied it even though it was slightly out of warranty. I sold the replacement and ordered an twin-stick Atlas.....which is what I should have done in the first place 3 years ago.

NIB