How to fix ABS systems with all new parts except the ABS box? on 1995 Dodge Ram Van 3500

Problem is the right read brake is pulsating when you step on the peddle with any pressure.Even changed/switched the axles to check for bent one. Put new wagner drums on incase the first new set was warped from the factory. Put new tires on to eliminate that too. HELP!

Asked by for the 1995 Dodge Ram Van 3500