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Message: <blockquote data-quote="5202500HD" data-source="post: 28544" data-attributes="member: 14829"><p>My 2006 2500HD I just drained and re-filled the Gear Box and here's what I found out. The OE Part numbers your Owners Manual calls out are discontinued or if you can find any is old and possibly broken down chemically and $45 a quart. I first wanted to use Valvoline but found after talking with them that the only OE spec'd fluid they have is sold directly and only to repair shops. The Synchromesh is not correct off the part store shelf since it's conventional not full synthetic. I ended up using Red Line MT-85. Took about 3.8 qts and I'll run it and recheck after a drive to work and back.</p></blockquote><p></p>