I want to change the fluid, filters and flush the transmission and torque converter on my 2011 gmc 2500hd duramax. I saw a video online that used a Hayden fitting at the trans cooler return line. They put a clear tube from that fitting into a bucket and with the engine running poured fluid into the trans as the old fluid came out of the torque converter. I don’t know if they make a fitting like that for the 2500hd, I think they were working on a 1500. Do you have a better way of flushing the converter or a part number for an adapter?
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