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Unread 07-26-2014, 05:57 PM   #1
unabashedpraise
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swapped 249 for 242. leaking from rear output seal

I have searched and my eyes hurt from wading through hours of posts.

I recently swapped my 249 internal slip yoke for a rebuilt '96 242 with an external slip yoke. Rear driveshaft was shortened to fit by a drive line shop. Front ds is stock.

I began to notice a slight vibration at city speeds that grew worse at highway speeds. This resulted in atf all over the undercarriage. I flipped the rear ds and tried to get the phasing correct. Now I have little to no obvious vibrations. I replaced the rear output seal, which was ruined (spring off and bottom warped) with Napa #18108. However, I still have atf leaking from the rear seal.

Tomorrow I plan on checking to make sure the spring is still on the seal. Has anyone else had this type of problem? Some have said it may be clogged breather or speedo o ring. O ring looks good. Haven't checked the breather tube, but looked clean upon installation.

Any experienced ppl with this issue please chime in!

Also, advance says this is the correct seal, but it doesn't look the same. Any info? http://m.advanceautoparts.com/mt/sho...70n/15440047-P

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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-26-2014, 06:27 PM   #2
dusterdude
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If there is a bushing back there,you probably beat it to death,if so,it will never seal until you replace it
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Unread 07-26-2014, 06:35 PM   #3
unabashedpraise
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Only a bearing.
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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-26-2014, 07:33 PM   #4
mrgimble
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That is not the right seal. This is the one, NP242/231 rear output seal: 4370N. Make sure there is no up and down movement on the output shaft.
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Unread 07-26-2014, 08:43 PM   #5
unabashedpraise
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The Napa seal is not correct? According to the FAQ thread on xfer case swaps the Napa one is the correct one. I searched advance auto for that part number and receive two different choices. http://m.advanceautoparts.com/mt/sho...74919991c9+2+0
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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-27-2014, 08:41 AM   #6
mrgimble
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edit. I am unsure if the seal from the front page of the swap thread, 4370n, is for an internal or external slip yoke style. It is hard to go by pics from sellers as they are usually generic.

Also the Napa seal you posted 18108 looks right

http://www.napaonline.com/Catalog/Ca...108_0439467270

The 4370N seal is from the front page of the transfer case swap thread. National or Timken part number. The one from Advance you posted looks to be for a internal slip spline style, maybe just the wrong picture. You want the one on the left in this pic for an external slip.

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Unread 07-27-2014, 11:24 AM   #7
nnovickzj
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Part number for external slip yoke is 710633 or that's what I used
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Unread 07-28-2014, 01:37 AM   #8
unabashedpraise
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Advance says this doesn't fit the 242...?
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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-28-2014, 08:18 AM   #9
nnovickzj
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That's what I used in my 242 and I just swapped to a 231 and it fit there to I could be wrong though
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97 zj 5.2 40,000mi
locked front and rear, 242, 3.5 iro lift, 32x11.5 kenda klever, 28 laredos for the road
4x 130 watt 6" spots on the roof rack, h3 leds in stock fogs, 2 40w leds on the grill
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Unread 07-28-2014, 03:11 PM   #10
mrgimble
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Quote:
Originally Posted by unabashedpraise View Post
Advance says this doesn't fit the 242...?
It looks like the right seal. The Napa (SKF) part number 18108 looks right too. Apparently the 4730N I ordered from Amazon is gonna go back.
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Unread 07-29-2014, 04:51 PM   #11
unabashedpraise
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I may need to just go and measure each one to see what the inside diameter is.

Meanwhile, tomorrow I will see if the vent is blocked and if there is any play in the shaft.

Now that I am thinking about it, the vent hose on the 249 I took out was not attached. I assumed it just came off, maybe it blew itself off. When I installed the 242 I attached it with a clamp. I really hope that is the only issue...
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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-29-2014, 04:59 PM   #12
HighLonesome
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That vent is a true PITA to get to.
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Unread 07-29-2014, 05:11 PM   #13
unabashedpraise
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With all the atf coating everything I should be able to slide my hand in...
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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-30-2014, 04:00 PM   #14
unabashedpraise
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Unbolted the cross member and lowered the t case to access the breather tube. I tried to blow out the tube using air and it did seem to be clogged. However, I don't know where it goes to to see if it is chinked. I installed an 18" piece of hose as a temp fix.

Test drive shows that it still leaks. Maybe the seal is bad already? Going to try and get all three seals to compare and replace the current one. Hopefully this will take care of the issue.

I did check the internal slip on the 249, looks like it has the drive works brand type as seen at advance.

Can the rear half of the 249 fit the front half of the 242?
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1998 Grand Cherokee Limited; 5.2 L, 249

Help: Rear left lock doesn't lock using power locks, but will unlock. Any ideas?

-Born once, die twice. Born twice, die once.
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Unread 07-30-2014, 05:14 PM   #15
HighLonesome
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The breather hose routes from the top of the TC to the top center of the trans bellhousing. One of the bellhousing bolts is used to hold the breather down.
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