Duramax Diesels Forum Truck of the Week
  #1  
Old 08-30-2017, 03:14 PM
Alpo Alpo is offline
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Default 05 Allison TCM updates?

Howdy. A friend mentioned there may be updates to the TCM program for my Ally to increase pressures on the lockup clutch in the converter. Anyone know for sure? Called stealership today and they want to book it in and have me pay for 1.5-2 hours of time to "check." Would like to know more before I have to take it to them.

Background: towing up long hills in 5th, lockup clutch will slip and send tranny into limp mode. I've lived with it for a long time now by just dropping out of OD before it happens.

Thanks,
Al
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Old 08-30-2017, 03:19 PM
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Quote:
Originally Posted by Alpo View Post
Howdy. A friend mentioned there may be updates to the TCM program for my Ally to increase pressures on the lockup clutch in the converter. Anyone know for sure? Called stealership today and they want to book it in and have me pay for 1.5-2 hours of time to "check." Would like to know more before I have to take it to them.

Background: towing up long hills in 5th, lockup clutch will slip and send tranny into limp mode. I've lived with it for a long time now by just dropping out of OD before it happens.

Thanks,
Al
05 LLY D/A Banks tuner/intake/exhaust.
Your friend wrong.
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Old 08-30-2017, 03:42 PM
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Quote:
Originally Posted by Mike L. View Post
Your friend wrong.
Lol

Alpo,you need built Ally now
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Old 08-30-2017, 04:03 PM
Alpo Alpo is offline
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Ha! Thanks, Mike and Hambone.
Alpo
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Old 08-30-2017, 04:10 PM
JRein JRein is offline
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I bet the C3s are starting to go. Be careful in 3rd as well. C3 is applied in 3rd and 5th

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Old 08-30-2017, 06:41 PM
Alpo Alpo is offline
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Ok, thanks.
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Old 08-31-2017, 11:32 PM
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Line pressure isn't controlled electronically in your 05, all you could change is how quickly the tcc locks up, but once locked, it goes full pressure, so if you're slipping on hills, theres an internal issue. And I don't believe there was any updates to the tcm programming for the 05. I know 01 and 02 had some updates, but that was for a harsh 2-1 downshift, and to add overdrive lockout.
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Old 09-01-2017, 06:58 AM
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Quote:
Originally Posted by THEFERMANATOR View Post
Line pressure isn't controlled electronically in your 05, all you could change is how quickly the tcc locks up, but once locked, it goes full pressure, so if you're slipping on hills, theres an internal issue. And I don't believe there was any updates to the tcm programming for the 05. I know 01 and 02 had some updates, but that was for a harsh 2-1 downshift, and to add overdrive lockout.
When TCC occurs, it drops 100 PSI across the board.
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Old 09-02-2017, 12:05 PM
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When TCC occurs, it drops 100 PSI across the board.
Once the tcc is commanded 96%, it goes to full line, that is what I was talking about.
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