@ Charon9 -
I too have a 99 Dodge (Durango) with the same trans (46RE) I think. I've had it since last August & acquired it with a trans leak. My wife & I also have an '07 Caravan that takes the +4 fluid. I've been just using that to top off my Durango also. We've just recently started hearing a ticking noise in the transmission, which I have deducted as the trans pump (checked the flex plate). I could be completely wrong though - transmissions are not my forte. Just yesterday my wife was highway driving (not far from home) & the trans started skipping/slipping between 2nd/3rd gears. by the time I got home from work - the trans was completely cooled down & gave me no issues at all, except for the ticking noise after parking it. So I had the theory that the incorrect (or store brand) fluid could be causing the issue. Any thoughts?
