2007 Allison MD 3000 RM, School Bus, Transmission Assys, Fits to: Thomas Built Saf-T-Liner HDX, (Used) 2007 Allison, TRANSMISSION- Model: 3000RM, Serial Number: 9330009121, Parrt Number: 29544848, Engine: Mercedes OM906LA, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Serial# 9330009121, Casting# 9330009121, Truck Year 2007 1T7YN4A2671284110