1979 CJ5 4.2L 3 speed transmission seal leak - JeepForum.com
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Unread 07-20-2013, 10:41 PM   #1
jennkent5454
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1979 CJ5 4.2L 3 speed transmission seal leak

My transmission is leaking where the rear drive shaft goes into the tranny,
is that called the yolk?
this is where it is leaking from, right where the shaft exits the tranny. how hard is it to replace that seal? if someone knows of a write up please share it here!!!

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Unread 07-21-2013, 06:49 AM   #2
jeepdaddy2000
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That would be the transfercase output seal.
Drop the driveline
Remove the yoke
Pry the seal out
Carefully drive the new seal in and lube the lip
Clean the seal surface on the yoke with emery cloth and reinstall
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Unread 07-21-2013, 06:55 AM   #3
jennkent5454
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Is it similar to an axel shaft seal?
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Unread 07-21-2013, 05:15 PM   #4
jeepdaddy2000
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Number 7
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Unread 07-21-2013, 05:59 PM   #5
jennkent5454
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that seems pretty simple but I have a few more questions-
1. drop the tranny to replace the seal or do it while it is in the jeep? any tips for this?
2. I need to drain the fluid in the tranny first correct?
3. is there a tool to remove it, like the slide hammer for the axle seals?
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Unread 07-23-2013, 09:26 AM   #6
SoK66
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You can do it with the t-case installed. Remove and install as described. Be sure to carefully inspect the bore. In many cases these have been gouged in an earlier seal replacement. The gouge will allow fluid to leak around the outside of the new seal. Use RTV on the outside of the seal to correct.
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Unread 07-23-2013, 09:34 AM   #7
JeffreyCharles
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Start your reading here: http://www.jeepforum.com/forum/f8/al...l#post14962860
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Unread 07-23-2013, 06:16 PM   #8
jennkent5454
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exactly what I was looking for. thank you
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Unread 07-23-2013, 08:02 PM   #9
JeffreyCharles
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And don't forget to document your experience and post it for the next guy. Every little bit helps!
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Unread 07-24-2013, 02:15 PM   #10
Jamesromeos
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I did 2 seals on my tranny before replacing the yoke. 29.00 for new yoke, spend the money so you don't pull your hair out like I did for 3 months.
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Unread 07-26-2013, 06:55 PM   #11
jennkent5454
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I normally get auto parts at advance auto parts. I went there today to buy the seal and we could not come up with the seal I thought I needed. here are 2 from thier website, is either of these the correct seal?
seal01.jpg

seal02.jpg

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Unread 07-26-2013, 07:30 PM   #12
7CJ5White6
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Well do you have the T150 or T15A?
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Unread 07-26-2013, 08:05 PM   #13
jennkent5454
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T150, but it's not Borg-Warner, or tremec. Or does that not matter?
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Unread 07-26-2013, 08:07 PM   #14
rah2eq
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Neither of those is the correct seal. Unless your Jeep is a two wheel drive, the drive shaft connects to a transfer case. What you are looking for is a rear output seal for a Dana/Spicer 20 transfer case. This is number 7 in the exploded diagram above.
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Unread 07-26-2013, 08:25 PM   #15
jennkent5454
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here is the one I see for spicer 20, but it also says 2spd.
seal04.jpg

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