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Old 07-12-2012, 12:00 AM   #2
mcmlxix
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Join Date: Apr 2003
Location: Las Vegas
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Re: 4l80e shifting ?

I think it depends on the year and what operating system is on the ECM/PCM, the software may be able to adjust shift points. Talk to the person that tuned your ECM, see if they have any info about your tune.
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