We have our 1988 RD686SX Mack Cab & Chassis for sale . This truck was going to be used for our rolloff body however we purchase entire truck with body on it alright so this truck is for sale. The spec"s are as follows; 300 hp Mack diesel engine , 6 speed low hole trans , 44,000 lb Mack rears (4.17 ratio), Mack 44,000 lb Camelback Suspension , 234 wheel base , double frame , 11R24.5 rubber on open Dayton rims 75% rubber remaining, brakes-suspension-steering all in good condition , air conditioning , air ride drivers seat , cab in good shape , power take-off on trans but no hydraulic pump.