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Old 08-05-2018, 09:56 PM
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Sent you a PM... I'll wait a bit longer before doing mine... Atomic's up haha
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Old 08-06-2018, 07:59 AM
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Sold to Atomic.
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Old 08-06-2018, 01:05 PM
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Originally Posted by Choda
I received my TCM back from HP Tuners and have a spare 2018 8 speed TCM with GMs latest transmission tune on it. Any one want it, so they don't have any down time when sending yours to HP Tuners?
Have you tuned your unlocked tcm? Looking for feedback
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Old 08-06-2018, 02:49 PM
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Originally Posted by tyler.frost92
Have you tuned your unlocked tcm? Looking for feedback
going Wednesday
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Old 08-07-2018, 12:06 AM
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So if you get a used TCM from a parts truck or whatever, do you have to do a security relearn when installing it in your truck, or does a dealer have to actually program it to work in your truck?
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Old 08-07-2018, 07:17 AM
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Originally Posted by RotaryResurrection
So if you get a used TCM from a parts truck or whatever, do you have to do a security relearn when installing it in your truck, or does a dealer have to actually program it to work in your truck?
dont know but my tcm is in the mail going to Atomic. He actually asked me a similar question. We'll see what he says.
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Old 08-21-2018, 06:45 PM
  #67  
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How's the tuning going...……...
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Old 08-22-2018, 09:50 AM
  #68  
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Found the problem that the 8spd folks are experiencing. Clutch compensators are fed by lubrication oil rather than the dedicated and regulated feed design of the 6L80. Source; https://media.gm.com/media/us/en/che...o-8-speed.html
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Old 08-22-2018, 11:59 AM
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Originally Posted by 2001 Sierra
Found the problem that the 8spd folks are experiencing. Clutch compensators are fed by lubrication oil rather than the dedicated and regulated feed design of the 6L80. Source; https://media.gm.com/media/us/en/che...o-8-speed.html
That article says it's a design feature, not a cause of the issue.

And if it were a cause of the issue, tuning wouldn't be the cure. And so far tuning seems to be the cure.
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Old 08-22-2018, 12:20 PM
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Not that the article mentions the problem but I saw this as the culprit as even the stealerships don't know causes or fixes...…………..
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