recently purchased, rockwell axles and trans case, 6.17 gears, think it is early factory 4x4 installation in medium duty class. not sure on trans, think it's a clark 5 speed. 370 big block, double frame, p/s assist cylinder on pass wheel and p/s cooler under hood. 6,000lb autocrane on rear of truck. have pics on e-mail, don't know how to transfer, new to forums