Allison 4000 TCM (Transmission Control Module) Failures - Printable Version

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+--- Thread: Allison 4000 TCM (Transmission Control Module) Failures (/showthread.php?tid=7437)

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Allison 4000 TCM (Transmission Control Module) Failures - hypoxia - 06-23-2023

The Allison shop that replaced my Allison 4000 transmission advised me that the old style TCM is guaranteed to fail.  I took that advice and had them replace it.  Apparently the bonding material between the connector and the body of the TCM fails which causes broken connections internally.  That's the way I understood it.  This place is busy with tow trucks dragging in every kind of truck and busses all day and night.  They had TCM's everywhere I looked and said they commonly replace a dozen a day.

If you have that TCM you may want consider that and do your research.
 
Atlantic Detroit Diesel-Allison, Middletown, CT

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RE: Allison 4000 TCM (Transmission Control Module) Failures - RobSC - 06-23-2023

Thanks for the heads-up Jim.  I just took a look at mine and it seems to match your new one.  Hope your issues are all solved by now.

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RE: Allison 4000 TCM (Transmission Control Module) Failures - hypoxia - 06-23-2023

(06-23-2023, 09:55 AM)RobSC Wrote:  Thanks for the heads-up Jim.  I just took a look at mine and it seems to match your new one.  Hope your issues are all solved by now.

Yes, you are golden.  Only remaining annoyance is the failure of E-Z Steer.

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RE: Allison 4000 TCM (Transmission Control Module) Failures - afrench - 06-24-2023

Is this the old style looked like?

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RE: Allison 4000 TCM (Transmission Control Module) Failures - hypoxia - 06-24-2023

(06-24-2023, 07:52 AM)afrench Wrote:  Is this the old style looked like?

Yes that is the old style.
   

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