Absolutely cannot stop the transmission leak - JeepForum.com

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post #1 of 26 Old 03-06-2017, 04:58 PM Thread Starter
bck4more
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Absolutely cannot stop the transmission leak

I don't know what else to do I have put 4 rear output shaft seals in the transmission and 2 input shaft seals on the transfer case I cannot get it to stop leaking fluid i'm putting them in evenly and making sure there's no debris or anything left on the housings I don't know what to do

Tf 999 transmission
231 transfer


1987 4.2 automatic, 33" Pro Comp, 2100MC, nuttered, SOA, SYE,TW driveshaft
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post #2 of 26 Old 03-06-2017, 05:16 PM
bpounds
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Sounds like a problem with the exterior surface of the shaft. Maybe the input gear on the TC? Needs to be a near mirror finish.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #3 of 26 Old 03-06-2017, 05:28 PM Thread Starter
bck4more
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Well here is also kind of the dilemma I had a buddy help me install the transmission and transfer case the first time and he had the transmission mount backwards did not know that so we could not get the studs to line up on the crossmember so he hooked a big heavy duty ratchet strap to the transfer case to try to pull it over and he pulled it too far I think and when he went to release it it was very violent during the return the return so I'm wondering if that could have caused so issues as well.

1987 4.2 automatic, 33" Pro Comp, 2100MC, nuttered, SOA, SYE,TW driveshaft
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post #4 of 26 Old 03-06-2017, 05:29 PM
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Take a look at the transfer case input shaft. Does it have a deep groove worn in where it meets the transmission rear seal?
Is there any end play?
Is the transfer case input shaft bearing worn?

Check the trans output bearing too. It should be very tight, no play at all

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post #5 of 26 Old 03-06-2017, 05:57 PM Thread Starter
bck4more
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OK it will be a few days before I get around to pull it back apart again but I will check that stuff thank you very much for the help

1987 4.2 automatic, 33" Pro Comp, 2100MC, nuttered, SOA, SYE,TW driveshaft
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post #6 of 26 Old 03-07-2017, 11:31 PM
lclark2074
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Also look at the input baring to the 231 if theirs any side to side play it is bad. the AX15 and the 231 use the 231 input baring for stability. this in turn makes seals act bad then go bad!!! also i agree with previous post first.

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post #7 of 26 Old 03-19-2017, 09:12 AM Thread Starter
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Ok so finally got around to pulling

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the transfer case back away from the transmission I feel no play in the shaft of the rear of the transmission or the shaft on the transfer case the transfer case shift seems smooth there is these two lines going all away around the shaft but I do not feel them when I am rubbing them with my hand

1987 4.2 automatic, 33" Pro Comp, 2100MC, nuttered, SOA, SYE,TW driveshaft
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post #8 of 26 Old 03-19-2017, 09:30 AM
lovett86
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I know it's to late now but if you had put dye in the trans fluid you could have confirmed weather it was the tranny or transfer case

its a rusty one

http://www.jeepforum.com/forum/f22/90-yj-frame-swap-build-up-1434246/
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post #9 of 26 Old 03-19-2017, 09:34 AM
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Have you determined which is leaking, tranny or TC? You are only looking at the surface for the tranny seal in that pic. I don't see any evidence of leaking from the TC. Is there a trace on the tranny?

That surface looks okay in the pic. You want to run your fingernail along the shaft across those marks. If it doesn't snag your nail at all, it should be okay. Looks okay to me, and the inner mark is where the seal is located I believe.

Other than checking where the TC seal contacts, I'm not sure what else to tell you.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #10 of 26 Old 03-19-2017, 10:14 AM
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Is it possible the seal is leaking around the outside? Between the seal and case? That surface is often overlooked, and also often damaged when removing the old seal. Did you use some silicone or other sealant on the outer diameter when installing?

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #11 of 26 Old 03-19-2017, 10:29 AM Thread Starter
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As I run my finger around where the seal goes I do feel a couple of nicks so how should I go about treat that. And I'm bout 99% sure it's not the tc as I was lower and lower on the dipstick of the tranny




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1987 4.2 automatic, 33" Pro Comp, 2100MC, nuttered, SOA, SYE,TW driveshaft
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post #12 of 26 Old 03-19-2017, 10:46 AM
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First make sure there are no upsets on the rim of the seal seat. Those would cut or damage the seal as you drive it in. I think I would use a little silicone on the seal before driving it in. A tiny bead. It won't take much. Aviation gasket sealant would be another option.

I confess to having a love affair with this stuff.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #13 of 26 Old 03-19-2017, 04:32 PM
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http://http://www.jeepforum.com/foru...short-1286648/
Quote:
Originally Posted by bck4more View Post
As I run my finger around where the seal goes I do feel a couple of nicks so how should I go about treat that. And I'm bout 99% sure it's not the tc as I was lower and lower on the dipstick of the tranny




Attachment 3255217
that is not where the tranny output seal goes. heres a link to show you where it goes http://www.jeepforum.com/forum/f9/np...short-1286648/

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post #14 of 26 Old 03-19-2017, 04:48 PM
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look at the bottom of the page you will see what I mean

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post #15 of 26 Old 03-19-2017, 05:24 PM
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Quote:
Originally Posted by lclark2074 View Post
http://http://www.jeepforum.com/foru...short-1286648/

that is not where the tranny output seal goes. heres a link to show you where it goes http://www.jeepforum.com/forum/f9/np...short-1286648/
I'm not following you. That thread is talking about long versus short TC shafts. And apparently Teraflex makes an extended seal that can reach out to a short shaft. I wasn't aware of that product, but I don't see how that is the problem here. OP I assume is using the same tranny and TC that was in it originally. I guess I'm missing your point. Either way, that is where the seal goes in the rear of the tranny.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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