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So i went through the process to drop and install a new transmission into my 08 Malibu. My model is the one infamous for having the transmission go bad, its the 3.6l V6 option.

I've read online that I may need to re flash my tcm as to not ruin the transmission I just put into it. Does anyone have any input on this?
 

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2011 Malibu LTZ 3.6L V6 Red Jewel Tintcoat
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I don't believe you need to, but wait for others to comment before you run off and listen to just one person.

Did you replace it with one from the same year? If so, see if you can get the VIN of the donor vehicle and call a dealership to see if the trans service for 3-5-R Waveplate was ever performed. If not, you may have another issue about to happen.

If it's from late 2010 through 2012 then you should be good.
 
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