Hey guys, I'm changing the oil in my gear box for my '98 Dakota NV3500. The dealer doesn't have the Mopar part# 4761526 on hand and I'm told it's quite expensive. Has anyone used the Royal Purple Synchromax for this application and does it work? I've heard it is compatible but that is just from the internet, it's supposed to be for manual transmissions that are spec'd for automatic tranny fluid. The dealer is not much help. Does any of this make sense? Can anyone make sense of this? thanks, Steve.