[rooster]

Thank You. My predicament is that I do not know what model rears I am looking for. I would like to change the ring and pinion but need to know model axle that Newell used that year. The metal tag on the axle is nowhere to be found so I cannot identify my axle. Someone said Rockwell QRD100, but I need someone with a similiar setup with the 555 cummins who can tell me what axle they have. Mine is a 79 36 foot with 4 spd allison. I think I have gears in the 5's and need something around 3:55.