No ATF+4 in the 98 actually. ATF+4 for "everything" is internet rumor gone amuck. One can't just rely on what you read on the interwebs.
Directly from the FSM:
"Mopar ATF Plus 3, Type 7176 automatic transmission fluid is the recommended fluid for Chrysler automatic transmissions.
Dexron II fluid IS NOT recommended. Clutch chatter can result from the use of improper fluid."
+4 has different properties. In most old, high mileage applications like a '98 would be, just switching to +4 now results in the seals leaking. Usually all of them. Also, the mechanic will always need to know it is +4 becasue the wear poperties are different too (color, smell, etc usually used to diagnose "bad" fluid which are no longer applicable with ATF+4.)
Last edited by IndyDurango; 06-20-2011 at 01:46 AM.