Allison OEM trans line part numbers - Chevy and GMC Duramax Diesel Forum
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Old 04-06-2011, 09:41 PM   eBay Motors  #1 (permalink)
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Allison OEM trans line part numbers

I was looking at gmpartsdirect microfiche and I cant figure out what parts I need to change all three trans cooler lines.

Can somebody help me with this please?

No offense to any aftermarket kit makers out there. I have decided to stay OEM.
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Old 04-07-2011, 03:14 PM   eBay Motors  #2 (permalink)
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This might help.




Subject: Transmission Oil Cooler Line Leak (Replace Affected Cooler Line)


Models: 2006-2007 Chevrolet Silverado Classic 2500/3500 Series

2007-2009 Chevrolet Silverado 2500/3500 Series

2006-2007 GMC Sierra Classic 2500/3500 Series

2007-2009 GMC Sierra 2500/3500 Series

Equipped with 6.6L Diesel Engine (VINs D, 2, 6 -- RPOs LBZ, LLY, LMM)




--------------------------------------------------------------------------------
This bulletin is being revised to update the warranty information. Please discard Corporate Bulletin Number 08-07-30-049 (Section 07 -- Transmission).

--------------------------------------------------------------------------------
Condition

Some customers may comment on a transmission fluid leak. This concern will be more prevalent in extreme cold climates.
Further inspection may find that the leak is coming from one of the transmission cooler lines at the hose to steel line crimp.
Correction

If the under vehicle inspection reveals transmission fluid leaking from one of the cooler lines, replace the affected cooler line. New transmission cooler lines have been released to address this concern. These new lines have been manufactured with an updated crimp process to better withstand the cold temperatures. Refer to SI for the replacement procedures.
Parts Information

Part Number
Description

20759971
Pipe Assembly, Trans Fluid Cooler (Upper/Outlet)

20759972
Pipe Assembly, Trans Fluid Cooler (Lower/Inlet)

20759973
Hose Assembly, Trans Fluid Aux Cooler Inlet
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Old 04-11-2011, 10:19 AM   eBay Motors  #3 (permalink)
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3 dealers 3 different answers.

gmpartsdirect:
20835127
20835123
20759971

Local dealer
2759973
2759972
2759971

Local dealer
20835123
20835125
20835127

Local dealer
20835127
20759971
20759972

I am totally confused
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Old 04-11-2011, 10:40 AM   eBay Motors  #4 (permalink)
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I am just guessing it's because they have changed them so many times. I know you said you want to stay OEM, but why would you want to when the OEM ones suck? I have a brother in law that has a 2010 with less than 10k miles and has already had to replace his lines. If they were replacing them under warrenty then maybe I still wouldn't want the hassel of changing them every 10k miles. I just put 2 sets of aftermarket lines on this weekend and it's the way to go for sure.

I am pretty sure anyone of those sets will work for you. GM says they correct the problem about every year and come out with new ones that still leak. So I guess just pick a set and go with it. I am sure they will all work on your truck and they will all leak again.
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Old 04-11-2011, 11:07 AM   eBay Motors  #5 (permalink)
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I'm still not convinced that rubber for the entire length of the run is the answer. Yes, they have not leaked. Yes, I believe they will not leak over time.

My concern is rubbing and abrasion against the rubber lines and them coming into contact with hot surfaces, exhaust etc. It appears that there is no way to secure the run from the trans to the cooler.

Lastly, I wont do this my self. I am a putz when it comes to wrenching. I dont have access to a shop that is familiar with installing this aftermarket stuff.

Overall, I like the all seasons the best but again getting somebody unfamiliar with installing is a problem.
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Old 04-11-2011, 12:02 PM   eBay Motors  #6 (permalink)
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Well I would be amazed if they did rub through, but just in case I wrapped a few spots that look like they are touching like by the oil pan with exhaust wrap that you can get at the auto store for pretty cheap. If you don't have the means to put the stock ones on yourself your going to have to take it to the same place that would install the aftermarket ones for you. Whatever you decide I wish you luck and them not leaking.
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Old 04-11-2011, 12:24 PM   eBay Motors  #7 (permalink)
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There was a really good DIY thread on the installation of the alligator/husker hoses. I used the search engine but cant seem to find it. Can somebody post the link please?

I am taking my truck in to a allison service center for Transynd flush and service. I was gonna have them do the lines at the same time.
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Last edited by Enigma66; 04-11-2011 at 12:29 PM.
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Old 04-11-2011, 12:29 PM   eBay Motors  #8 (permalink)
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How To: Alligator Tranny Cooler hoses Kit Install
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Old 04-11-2011, 12:30 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by Enigma66 View Post
There was a really good DIY thread on the installation of the alligator/husker hoses. I used the search engine but cant seem to find it. Can somebody post the link please?

I am taking my truck in to a allison service center for Transynd flush and service. I was gonna have them do the lines at the same time.
where do you find an Allison service center?????

I saw the article on the Alligator lines, guy did a killer write up with pics, ill see if i can find it 4 ya
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Old 04-11-2011, 12:32 PM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by glock-hater View Post
where do you find an Allison service center?????

I saw the article on the Alligator lines, guy did a killer write up with pics, ill see if i can find it 4 ya
Allison Transmission
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