The present rear end is a 2 speed with no axles and the pinion is wasted as well as the bearing,WHAT IS LEFT OF THE BEARING WAS IN THE HOUSING!!This is not my truck but belongs to a friend of mine. This truck was bought as is and has the rocket hood emblem and the gmc 350 logo on front.Just want to know what aftermarket rear will fit.Is a c50 a 2 speed axle? This truck has a factory 347 Pontiac 5 speed trans and would very much like to know from you guys what can be done to make this doable. Open for suggestions!! Thanks in advance for any info and have a BLESSED DAY