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I too use synthetic In my 08 duramax but the 400 friction plates and seals was not designed for that, there are companys out there selling the "wonder" fluids for the application but use at your own risk problems won't show up right away buy what I have seen from this was lip seals swelling...
Trans Temp
On the turbo 400 with the deep cucv pan and a added cooler by the time your fluid cycles your temp will average around 137 degrees, you will be fine with what you have done it will extend the life of your trans. Sure mountains, spinning in snow, heavey loads etc.... you can expect...
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