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Old 11-07-2015, 12:12 PM
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Newbie w/ Transfer Case Issue

I need a little guidance on dealing with my transfer case. 1997 Wrangler TJ 4cyl. Transfer case is NP231J. My question is: Is there supposed to be an oil slinger on this one?

I had a lead from the rear pinion seal and decided to replace it. I figured while I was down there I'd go ahead and replace rear drive shaft u-joints. When I pulled the rear drive shaft off, the boot also tore where it came off of the transfer case. All of the diagrams I have seen show an oil slinger. Mine does not have one. I was thinking that maybe the PO had removed it for some reason. I know I need a new boot but what I don't know is if there are different types of boots for transfer cases that do or do not have the oil slinger.

Any advice would be greatly appreciated. Thanks!

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Old 11-07-2015, 12:35 PM   #2
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The slip joint is not part of the rear seal on the TJ 231 so there is no oil to sling

There is an oil pump inside the transfer case with a pickup tube and screen on end of pick up Tube

On the YJ 231 the slip joint is part of the rear seal but not on the TJ

None have an oil slinger but some have a balancer

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Old 11-07-2015, 02:02 PM
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When I pulled the rear drive out, the boot tore off at its connection on the transfer case side. I don't see a metal ring holding it on. How do i remove it? Does the shaft that is now protruding have to be removed to replace the boot? I've seen pics of NP231 transfer cases with an "oil slinger" on the rear of the case, but mine doesn't have one. I was concerned that the PO may have removed it and replaced it. From what I can tell by looking at others' photos, the boot secures to the oil slinger on the transfer case side and the drive shaft on the other side.
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Old 11-07-2015, 02:21 PM   #4
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No oil slinger on 231 transfer case



What oil would it be slinging

You think the slip joint boot is supposed to be full of oil and then that oil needs slung around?

To what imaginary purpose?
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Old 11-07-2015, 03:48 PM
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I know there was no oil in the boot. The boot is just there to keep debris out of the splines on the drive shaft. Maybe it's because of built up dirt, but I don't see where the boot was strapped to the shaft that was connected to the rear drive shaft. I don't have any leaks from the transfer case and I don't want to go poking around trying to remove the remaining piece of that rubber boot if I might damage a seal. The only reason I mentioned the oil slinger is because I saw them on photos of other transfer cases.
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Old 11-07-2015, 04:00 PM
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Here's a couple of pics if this helps. (I hope these upload)

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Old 11-07-2015, 04:08 PM   #7
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It a 231 and it never had and never should have oil on outside of case on the slip yolk joint and never had or should have an oil slinger
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Old 11-07-2015, 04:15 PM
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That's just the name that I saw it labeled on parts diagram. Here's a pic from somewhere that shows the "oil slinger" that the boot is attached to. I've looked up the part on Quadratec and other parts places and they have them. It's just that in my case I don't have one. Either because mine never had one or it was removed. In either case, my question is how to remove the remaining piece of the boot.

http://www.4x4xplor.com/images/SYE-CV/DSC08238.jpg
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Old 11-07-2015, 05:00 PM   #9
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Watch first 4 and 1/2 minutes

http://m.youtube.com/watch?v=_DkuLOFs8wI
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Old 11-07-2015, 05:26 PM
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My problem is when you get to 3:55 on the video. I don't have that metal cover. The oil seal is underneath it and the slip yoke boot separated from whatever point it was attached to. I can't tell what the boot attached to. The only replacement boots that I can find attached to that metal piece that they're removing at 3:55. Right now, all I see is what looks like a split ring but I wouldn't think that was the only thing holding that boot in place. Thanks for your help. I know I may not have the terminology correct. Here's two more pics.
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Old 11-07-2015, 05:37 PM   #11
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Poor choice of name but guess maybe you want to buy this but does notion
Quite the same

http://www.4wheelparts.com/Drivetrai...n=CRO5016615AA
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Old 11-07-2015, 05:42 PM   #12
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If you google crown 5016615aa

You can find it on amazon or summit or other places
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Old 11-07-2015, 05:51 PM
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Yeah, that's the part all right. Don't know why they call it an oil slinger. I don't why the PO wouldn't have replaced it other than just being lazy. I'll order one. Still have to figure out how to remove the remaining piece of rubber boot. Thanks!!
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Old 11-07-2015, 10:18 PM   #14
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Old 11-08-2015, 10:26 AM   #15
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You are probably already missing the stop spacer
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Old 11-09-2015, 10:38 AM
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Just got done looking REALLY close at some parts diagrams. Yes, I am missing the stop spacer and the "oil slinger". Looks like the PO probably replaced the seal but didn't replace the "oil slinger" and just kind of left it. From what I've looked at, the oil slinger is pressed onto the output shaft so that when the dust boot is clamped to it, it spins with the drive shaft.

Just ordered a new slinger and dust boot. I'm not too worried about the spacer as long as I don't drive the new slinger too far down the shaft. I was just going to use a pipe to drive the slinger onto the output shaft unless you have another suggestion.

Thanks for all of your help! I love this forum, so much information here.
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Old 11-09-2015, 03:26 PM   #17
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It was probably left off because when they are removed, they get destroyed a lot of the time. They bend easily and if it's tough to remove, it can really get messed up trying to pry it off. PO probably didn't bother to get a replacement and I'm sure the original was unusable.
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Old 11-18-2015, 04:30 PM
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Update: Purchased a new slinger and dust boot. I squared off an old piece of pipe that I'll use to slide over the output shaft so that I can tap the new slinger into place. Been raining here pretty good so I'll try and get this in on Friday or Saturday along with the rear drive shaft. I"ll post some pics and let you know how it goes.
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Old 11-22-2015, 07:35 PM   #19
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Sounds weird I know, but I cut the end off an old T-Ball bat and slipped it over the shaft to set the seal and slinger. Worked great.
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Old 11-28-2015, 05:04 PM
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Finally!

I finally had a day without rain AND I was off! Used the pipe and hammer method to tap the slinger into place and it worked perfectly. I posted pics below. I think there's also supposed to be some kind of ring to stop the slinger from being seated to deep but I didn't have one. I just looked at various pics and eye balled it. Seems to be working great so far! Hopefully this helps someone else along the way.

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