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redline mtl fluid

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I was wondering which weight redline trans fluid should I use? there are like 3 different weights to choose from... Do you think this will help my 2013 boss? I have ordered the mgw shifter was thinking of changing the fluid at the same time any info would be great ! I didn't know about this problem with these cars till I bought it I am bummed out maybe you nice people can help :D
I'm using the 70/80 in mine. So you're not surprised you'll have a noticeable increase in noise with the MGW. Good luck with the changes.

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