Prepping/Rebuilding transfer case before install? - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 6 Old 04-13-2018, 07:24 AM Thread Starter
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Prepping/Rebuilding transfer case before install?

Hi all,

I finally scored a Rubicon transfer case for my 2017 JKUWW after searching for close to a year. The transfer case comes from a 2010 JKUR with 88k miles. My JK only has 15k miles on it so I want to make sure that what I'm putting on it will last a while.

With the donor transfer case having 88k miles on it and 7 years under its belt, should I perform any maintenance, rebuilding or internal cleanup on it, and if so, what?

I figured I'd clean it real well with some brake cleaner and oven cleaner if needed on the outside, but my concern is the inside and switching all the consumable internals if need be. Of course I'll use good ATF4+ oil to flush and fill it.
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post #2 of 6 Old 04-13-2018, 08:23 AM
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A transfer case is pretty simple, there are no true consumable parts like clutches etc. Your biggest concerns would probably be the input/output shaft seals, and the chain stretching. The output shaft seals are not really any harder to change later than now so I'd just leave them and see how it is, swap them out if they leak. You just have to take off the output yoke which you can easily do with the case mounted in the vehicle. Might be worth swapping out the input shaft seal since it's a pain later as you'd have to drop the case. See how the input and output shafts feel, if the bearings are tight no need to change them, there should be a tiny amount of axial slop (I don't know the actual spec, but on the order of a small fraction of a millimeter), and zero radial slop. That is assuming the yokes are installed, there'd be huge axial slop without the front output yoke installed.

In conclusion, I'd change the input seal, see how the bearings feel, and if they feel good then run it.

JK has a pretty beefy transfer case, there's a pretty good chance everything is perfect, except the seals who knows, a seal is a seal and depends on how the vehicle was treated and what it was used for (wheeling mud holes is particularly terrible on shaft seals)
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post #3 of 6 Old 04-13-2018, 08:26 AM
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Quote:
Originally Posted by CaveDiver View Post
Hi all,

I finally scored a Rubicon transfer case for my 2017 JKUWW after searching for close to a year. The transfer case comes from a 2010 JKUR with 88k miles. My JK only has 15k miles on it so I want to make sure that what I'm putting on it will last a while.

With the donor transfer case having 88k miles on it and 7 years under its belt, should I perform any maintenance, rebuilding or internal cleanup on it, and if so, what?

I figured I'd clean it real well with some brake cleaner and oven cleaner if needed on the outside, but my concern is the inside and switching all the consumable internals if need be. Of course I'll use good ATF4+ oil to flush and fill it.
Pull the drain plug if the magnet is clean put it in and fill it.

Sent from my SM-N910V using Tapatalk
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post #4 of 6 Old 04-13-2018, 08:32 AM Thread Starter
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Quote:
Originally Posted by christensent View Post
A transfer case is pretty simple, there are no true consumable parts like clutches etc. Your biggest concerns would probably be the input/output shaft seals, and the chain stretching. The output shaft seals are not really any harder to change later than now so I'd just leave them and see how it is, swap them out if they leak. You just have to take off the output yoke which you can easily do with the case mounted in the vehicle. Might be worth swapping out the input shaft seal since it's a pain later as you'd have to drop the case. See how the input and output shafts feel, if the bearings are tight no need to change them, there should be a tiny amount of axial slop (I don't know the actual spec, but on the order of a small fraction of a millimeter), and zero radial slop. That is assuming the yokes are installed, there'd be huge axial slop without the front output yoke installed.

In conclusion, I'd change the input seal, see how the bearings feel, and if they feel good then run it.

JK has a pretty beefy transfer case, there's a pretty good chance everything is perfect, except the seals who knows, a seal is a seal and depends on how the vehicle was treated and what it was used for (wheeling mud holes is particularly terrible on shaft seals)
Thanks that's really helpful, seals are easy and cheap to replace so might as well get it over with.
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post #5 of 6 Old 04-13-2018, 09:26 AM
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Will a 10 fit on a 17 ? I thought things changed a little?

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SYNERGY, FOX,VKS,HUTCHINSON,
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post #6 of 6 Old 04-13-2018, 12:50 PM Thread Starter
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Originally Posted by tapcola View Post
Will a 10 fit on a 17 ? I thought things changed a little?

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My 2017 JKUWW has a Manual Transmission which means it can use Rubicon Transfer Cases Manual 08-18 and even Automatic 08-11. If you have an auto you have to use Auto Transfer Cases from 12+
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