is no. The Silverado motor will not work in a Golden J. The motor is bigger and is the same motor size in the Super J. Golden Jubilee is a 1205 Motor with a 1205 and top trim difference.
Many times dust gets in the carbon brush tube - when you take the motor apart be sure to remove the carbon brush holders and wash them. Let them dry thoroughly. When dust gets in the brush tubes, it can make the carbon brush 'stick' somewhat in the tube - causing arching at the commutator and a slower motor speed.