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Old Sep 9, 2022 | 05:54 PM
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Default Shifting hard

2008 Silverado very hard shift from first to second, all other gears are fine. Started this a while back every so often now its every time. The whole cluster works with the exception of the tach it stays at 0. Was seeing if anyone had any ideas on what to check or look for.
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Old Sep 9, 2022 | 07:19 PM
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The 1st place to start is to scan the PCM/TCM for codes. Some codes not even related to the trans will cause it to shift hard.
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Old Sep 15, 2022 | 05:52 PM
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Cant establish a connection with scanner idling with the tach at 0 seems like its skipping
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Old Sep 15, 2022 | 10:56 PM
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I would sort that problem out 1st, that could be why the trans is shifting hard.
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Old Sep 29, 2022 | 09:23 AM
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Originally Posted by Aconger
Cant establish a connection with scanner idling with the tach at 0 seems like its skipping
might want to check the serial lines it could definitely be behind the hard shifting and no tach info going to the cluster also if you’ve had the pcm swapped and not had the vin in it changed to your vin (might seem completely unrelated but it’s a very common cause I’ve seen on stock setups with swapped pcms).
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Old Sep 29, 2022 | 09:47 AM
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Not sure on the pcm but thats what im leaning towards, i had the motor swapped out because of the afm issue and im not sure if they flashed the pcm for the new engine.
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