Atlas Transfer Case

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Zink.brody
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Joined: Sat Feb 09, 2019 3:41 pm

Atlas Transfer Case

Post by Zink.brody » Thu Jan 09, 2020 9:24 pm

Anyone out there running an atlas behind the TF727? I have some questions about some things for. Tried to do a search and couldn’t come up with much.

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Stuka
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Re: Atlas Transfer Case

Post by Stuka » Fri Jan 10, 2020 12:04 am

An atlas is easy to install behind a 727. Plenty of people have done it. Did you have a specific question?
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


will e
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Re: Atlas Transfer Case

Post by will e » Fri Jan 10, 2020 6:36 am

I am, running the 4spd version. I'll answer any questions I can.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge


Topic author
Zink.brody
Posts: 6
Joined: Sat Feb 09, 2019 3:41 pm

Re: Atlas Transfer Case

Post by Zink.brody » Mon Jan 13, 2020 12:13 am

Just wondering what ratio you went with and what your setup is. Motor, axles, ratio and tire size? How was the packaging. What was the change on drive shaft lengths?


will e
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Joined: Sat Aug 18, 2012 8:21 am

Re: Atlas Transfer Case

Post by will e » Mon Jan 13, 2020 7:43 am

My sig has most of the info. I went with 37" tires and 4.56 gears. With a non-OD transmission this works out okay on the highway but isn't deep enough for off road. That's why I went with the 4 speed. I picked up mine used but never installed. The main transfer case is 2.0. The auxiliary planetary gear is always 2.72. So I have the option of 1 to 1, 2 to 1, 2.72 to 1 or 5.44 to 1. 5.44 to 1 is plenty deep for technical stuff.

I had to replace the input shaft because the used case I bought was set up for a Nissan. It' was pretty easy to swap out the input shaft.

With the addition of the planetary gear the case sits a bit further back compared to a stock np208. So the rear shaft was shortened and the front shaft was lengthened.

I had to trim the 'coffin' for the fuel tank a bit.

I am having issues with the planetary gear popping out when engaged in low. I believe this is an adjustment issue and when I get a chance will drop the case and take a look.

I mostly drive around the trails in 2.0 and often just with the rear wheels.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

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Stuka
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Re: Atlas Transfer Case

Post by Stuka » Mon Jan 13, 2020 1:25 pm

Wish my JK had a three speed case. The 4:1 is awesome for crawling, but sucks for most trail cruising. But high range is often too high and results in increased trans temps.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


will e
Posts: 3976
Joined: Sat Aug 18, 2012 8:21 am

Re: Atlas Transfer Case

Post by will e » Mon Jan 13, 2020 6:30 pm

Stuka wrote:
Mon Jan 13, 2020 1:25 pm
Wish my JK had a three speed case. The 4:1 is awesome for crawling, but sucks for most trail cruising. But high range is often too high and results in increased trans temps.
Even with the OD transmission? I would think that would help some. But I agree that 4 to 1 is too low for trail cruising. My 2.0 is about perfect for shelf roads and non technical stuff. And it's a blast running sandy washes in 2.0 rear wheel only. I can whip it up to 30 or 35 mph in no time.

The JK's have such a low first gear in their transmissions the stock transfer case should suffice for most people.
81 Waggy 'WILL E' Retired
82 Cherokee WT - SOA/SF/high steer/Alcan springs/agr box/Borgeson steering shaft/AMC 401/performer/holley TA/HEI/BeCool/727/ALTAS (2.0/2.72/5.44)/D60 Snofighter(Yukon Zip,hubs,stubs,4.56)/14 Bolt (FF,BF shave, Discs, ARB,Artec Truss)/MTR 37X12.5/Corbeau XRS Baja & 5 point retractable harness/Hella Aux lights/tuffy console/killer32 sliders/Evil Twin bumpers, rack and roll cage/WARN 8000/TT Fabworks steering brace/dual batts/custom TC skid plate/ARB fridge

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