Some GMC Sierra HD Units Will Need A Transmission Filter Replacement

[Ozark Dually]

GM has issued a service update for certain 2024 and 2025 GMC Sierra HD units that have been found to have sediment present in their transmission fluid, with a field action available to fix the problem.

 

https://gmauthority.com/blog/2024/10/some-gmc-sierra-hd-units-will-need-a-transmission-filter-replacement/

 

 

[revrnd]

Any reason why only GMCs? Wouldn't something like this possibly affect Chevs as well?

 

Do the Sierra HDs get a specific transmission?

Edited October 10, 2024 by revrnd

[newdude]

4 minutes ago, revrnd said:

Any reason why only GMCs? Wouldn't something like this possibly affect Chevs as well?

 

 

 

It affects both.  GM Authority loves to write like 10 articles about the same subject, so one recall that affects both Chevy and GMC trucks, they go and write two different articles about it.  

 

Here's the reacall - MC-11007937-0001.pdf (nhtsa.gov)

[revrnd]

3 minutes ago, newdude said:

 

 

 

It affects both.  GM Authority loves to write like 10 articles about the same subject, so one recall that affects both Chevy and GMC trucks, they go and write two different articles about it.  

 

Here's the reacall - MC-11007937-0001.pdf (nhtsa.gov)

As an side note, if it was an assy issue/plant related (like Oshawa building only Chevs), then yes specific models would be affected.

[newdude]

34 minutes ago, revrnd said:

As an side note, if it was an assy issue/plant related (like Oshawa building only Chevs), then yes specific models would be affected.

 

 

 

Correct.  It would identify the plant in there on the recall (or TSB).

 

This seems to stem from the transmission assembly plant hence it applying to both Silverado and Sierra HD.  

[revrnd]

41 minutes ago, newdude said:

 

 

 

Correct.  It would identify the plant in there on the recall (or TSB).

 

This seems to stem from the transmission assembly plant hence it applying to both Silverado and Sierra HD.  

I remember a recall where a fastener joint wasn't properly torqued. The number of cars involved was between 400 and 500. To my 'untrained eye' it sounded like the power tool used for that job didn't get or was improperly validated during a particular shift.

[64BAwagon]

I read it as a "process" error that likely was found during some failure analysis. I believe the bulletin states its a phased rollout and that the units should be serviced if they come in for any other issue. Seeing as mine has an open campaign on it for the communication module issue I guess the trans will get done then also. 

On a side note I found that Rockauto shows a Dorman 265587 transmission pan for the 10L1000 for a little over $140 and it includes a drain plug. Seems to be a little sturdier cast piece rather than the stamped unit that came stock. 

I would be interested to know what plant these trans are built at ?  Another glaring example of Allisons lack of involvement despite the labeling. 

 

 

I also noted in the bulleting that the service paid 1.6 hrs but the L8T paid 2.2 hrs. This would indicate that the pan drop is more complicated on the gas engine due to the exhaust. I really would hope to avoid having to loosen the exhaust. I am wondering if a little gentle persuasion would move that cross pipe just enough to clear that pan ? I am sure the techs will figure it out if it is, that extra .6 hrs would make that job a little more profitable. 

Edited October 10, 2024 by 64BAwagon

[lineman1234]

Like any and all my friends recalls on his 2024 gmc 3500 gasser.  The dealer calls him, as last week he got a call to schedule if he wanted the tranns recall. He also got the call for some programing update.  Has already had the tailgate and towing brake module ones done.

 

I havent gotten any Emails, calls or notices for my 2024 chevy 3500 gasser yet.

 

 

[newdude]

30 minutes ago, 64BAwagon said:

I read it as a "process" error that likely was found during some failure analysis. I believe the bulletin states its a phased rollout and that the units should be serviced if they come in for any other issue. Seeing as mine has an open campaign on it for the communication module issue I guess the trans will get done then also. 

On a side note I found that Rockauto shows a Dorman 265587 transmission pan for the 10L1000 for a little over $140 and it includes a drain plug. Seems to be a little sturdier cast piece rather than the stamped unit that came stock. 

I would be interested to know what plant these trans are built at ?  Another glaring example of Allisons lack of involvement despite the labeling. 

 

 

I also noted in the bulleting that the service paid 1.6 hrs but the L8T paid 2.2 hrs. This would indicate that the pan drop is more complicated on the gas engine due to the exhaust. I really would hope to avoid having to loosen the exhaust. I am wondering if a little gentle persuasion would move that cross pipe just enough to clear that pan ? I am sure the techs will figure it out if it is, that extra .6 hrs would make that job a little more profitable. 

 

 

GM Toledo Propulsion builds them - Toledo Propulsion Systems | Ohio | General Motors (gm.com)

 

Correct, the added time on L8T is for pulling down the Y pipe assembly.  Also, that is warranty time.  Customer pay would be 3 hours or just over 3 hours.  

[revrnd]

55 minutes ago, 64BAwagon said:

I read it as a "process" error that likely was found during some failure analysis. I believe the bulletin states its a phased rollout and that [b]the units should be serviced if they come in for any other issue[/b]. Seeing as mine has an open campaign on it for the communication module issue I guess the trans will get done then also. 

On a side note I found that Rockauto shows a Dorman 265587 transmission pan for the 10L1000 for a little over $140 and it includes a drain plug. Seems to be a little sturdier cast piece rather than the stamped unit that came stock. 

I would be interested to know what plant these trans are built at ?  Another glaring example of Allisons lack of involvement despite the labeling. 

 

 

I also noted in the bulleting that the service paid 1.6 hrs but the L8T paid 2.2 hrs. This would indicate that the pan drop is more complicated on the gas engine due to the exhaust. I really would hope to avoid having to loosen the exhaust. I am wondering if a little gentle persuasion would move that cross pipe just enough to clear that pan ? I am sure the techs will figure it out if it is, that extra .6 hrs would make that job a little more profitable. 

Would that include the complimentary oil changes?

[64BAwagon]

I may have to see who the tech at my local dealer is  that would be doing these, maybe slip him some cash to put the Superior drain plug in the pan while its down. 

 

 

I still cant get over having to drop the Y pipe for a pan drop. I have worked on dozens of Allisons in many different trucks and never had to drop exhaust to get a pan off (actually I never had to drop a pan because the Allisons were all designed to be servicable and most had filters that didnt require a pan drop), even the 1000 only needed the internal filter replaced at overhaul and not as part of normal maintenance. 

Edited October 10, 2024 by 64BAwagon

[Ry Guy]

The having to move the exhaust thing is a classic GM gas engine thing. Same thing on the 6L80 and 6L90. They swapped the trans for the 10L1000 and didn’t touch the exhaust routing. 

[Ry Guy]

On 10/10/2024 at 4:47 PM, 64BAwagon said:

On a side note I found that Rockauto shows a Dorman 265587 transmission pan for the 10L1000 for a little over $140 and it includes a drain plug. Seems to be a little sturdier cast piece rather than the stamped unit that came stock. 

 

Nice find. This is a direct fit for the 6.6 gas 10L1000? If so I will probably snag one since mine is all dented up from running over something 

Edited October 12, 2024 by Ry Guy

[64BAwagon]

In a perfect world I would ask the tech to replace the pan with the Dorman unit I supplied but I doubt that would happen. Theres a big difference between putting an aftermarket part on during a warranty claim vs adding a drain plug to the stock pan. Theres no money in comebacks and people get real wonky about issues from their non OEM parts. 

[64BAwagon]

I stopped today and have a tentative appointment next week at my local dealer. I also floated slipping the tech some $$ to put in the drain plug I have and they seemed receptive to it. (it helps that one of my boys used to work there and the service writer has known me for well over 10 yrs) 

I am hearing rumblings that this wasnt a process issue at the trans plant but rather a poor metal finish on some internal parts that may have caused some excess material to be shed ?  either way I am not excited about this.