Allison Leaking at shift linkage/nsbu - Chevy and GMC Duramax Diesel Forum
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Old 03-07-2010, 08:04 PM   eBay Motors  #1 (permalink)
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Allison Leaking at shift linkage/nsbu

Went on a long drive today, up a mountain pass over and back. On the way back my trans temp got up to 200*F. Which I thought was odd.
When I finally got home I noticed that there was oil under the drivers side. Upon further inspection it was coming from the tranny. I've noticed a sound coming from it upon start up.(sounds like a light metal sound) But goes away after warm up. Not sure if its related or not.
Inspecting the tranny it looks like its coming from around the shift linkage/NSBU switch. I thought it was coming out of the breather on top but when I looked it doesn't have that clean look,Like when oil is leaking out some where and cleans all the dirt off. But the Shift linkage/NSBU area does have that clean look.
I will attach some pictures.
I've circled the breather in one picture and the NSBU switch in another. Notice how much oil and how clean that area is.
Any help would be Appreciated.
Also I checked my tranny level and it seemes fine. I just checked it a couple days ago and it was good then too. I have't changed it or filled it in along time. So I don't think it was because it was overfull.
Sorry so long. Thanks again.
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Old 03-08-2010, 10:22 AM   eBay Motors  #2 (permalink)
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never seen that problem
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Old 03-08-2010, 07:10 PM   eBay Motors  #3 (permalink)
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I know, I haven't either. Usually if the tranny is overfilled it will come out the breather.
And any other tranny leaks that are common are from the tailshaft or I've read some threads where it is coming from the front seal of the tranny.
I thought I'd ask around here first and see if anyone has any ideas.
I'm probably just gonna have to take it to a shop.
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Old 03-08-2010, 07:38 PM   eBay Motors  #4 (permalink)
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I have had that exact thing happen, there is a seal between the trans. and the tranfer case that goes bad..(there is a bulletn from GM about it) what happens is the fluid from the tranny overfills the transfercase and it will come out of the breather for the transfer case. I did not want to do the job so i had ammco do it and it cost about 400.00 for everything... hasent leaked since
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Old 03-08-2010, 08:16 PM   eBay Motors  #5 (permalink)
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Originally Posted by AaronsLB7 View Post
I know, I haven't either. Usually if the tranny is overfilled it will come out the breather.
.
That also can happen if the vent is plugged..
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Old 03-08-2010, 11:49 PM   eBay Motors  #6 (permalink)
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Thanks for the replies guys.

daddysLBZ-You have a good point.

When I was looking under the truck and taking pictures. It looked to me like the oil came from the pan gasket. At the area I circled in red in one of the pictures. And not the breather. Just because it is so clean in that area. All that fluid coming out cleaned it. When I look up at the breather, indeed there is fluid all around it doesn't look as though a large amount came streaming down and cleaned all the dirt away. (Hope this makes sense).

D2ka4-I did have a leak between the transfer case and tranny before. Had a machanic fix it.

Anyone know how or if I can remove the breather and check it.(It looks like a PITA to get to.)
Thanks again fellas
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Old 06-14-2010, 04:14 PM   eBay Motors  #7 (permalink)
 
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have you found the problem aaronslb7? Mine just did the same thing this weekend pulling vantage grade
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Old 06-14-2010, 05:30 PM   eBay Motors  #8 (permalink)
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Where exactly is your fluid level. From the pictures it looks like it's coming down from the top. There is a linkage seal behind the NSBU switch which will leak if it gets old or if it's over full. It will only leak after truck is shut off and it sits for a while. Your fluid level must not be over half way up the hot grid on the dipstick, otherwise it will blow out the vent. If the vent on top of case is plugged, fluid will blow out the filler tube on passenger side.
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Old 06-14-2010, 05:47 PM   eBay Motors  #9 (permalink)
 
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when i noticed it leaking Ichecked the level and found it in the middle of the hot grid. My trans temp had gotten up to about 230(it usaualy runs 190-210 on my 8.1l). I had my dad tow my trailer home and drove the last 100 miles empty with no problems and the temp only reached 175.
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Old 06-14-2010, 06:28 PM   eBay Motors  #10 (permalink)
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Keith2001, No I haven't found the problem yet. It only happened that one time. I was going over White Pass between Colville and Republic. I didn't have a load on either.
You said you were going up vantage pass. Same vantage pass in washington?
I had checked my fluid before it happened and after and the level was in the right range. I still check it occationally and still checks out fine.
I thought that it did come from the breather but when I look it over really good there really wasn't any oil that had come from there. I looked more like it came from between the pan gasket and transmission.
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