(USED) 2006 Peterbilt 379 - TANDEM CUTOFF - Make: Spicer. Model: RDH40. Hub Bolts: 10. Ratio: 00390. Serial Number: HN01812209. Brake Type: Air Wedge. For more information about this item, give us a call. We ship Worldwide!. (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY. ELKTON, MD 21921