Harry,
The ATF+4 is a specification from Daimler Chrysler, and can be used in Dodge vehicles where the performance specification requires ATF+,+2,+3,or +4 as well as MS-7176 A,B,C,D & E;MS-9602.
Your 99'Ram, if it has the automatic does require an ATF with the +4 specification. And yes, Amsoil does meet those specifications with their ATF+4 as well as their newer "Universal" formulation.
amsoilman
------------------
94'SLT 4X4 AT/White in color. Factory Tow Hooks & Running Boards. Amsoil By-Pass filter, Amsoil Air cleaner,and all fluids are Amsoil. Optima "Red Top" batteries.
BD exhaust Brake, BD Torque Lock, BD Torque Converter, Dr. Performance Stage II Injection Pump. Mag-Hytec Diff Cover,Mag-Hytec Transmission Pan, Isspro Pyro, Boost,Oil temp Gauges mounted in 3 Gauge post mount. One gauge monitors Engine Oil, Trans, Diff. Temps.
Wayne Owen