4.2L V6, 5 SPEED, 8.8 LIMITED SLIP 3.55 GEARS, 126 INCH WHEEL BASE, K&N FILTER IN HOMEMADE AIR INTAKE SYSTEM, 275/60/17 TOYO PROXES COMIN SOON. 16-18 MPG IN TOWN/20-22MPG HIGHWAY, *** IT WILL BURN ANY V8 CHEVY PICKUP AROUND HERE***, CHEVY OWNERS TAKE A GOOD LOOK AT THE PIC CAUSE THATS THE ONLY TIME YOUR NOT GONNA BE LOOKIN AT THE TAILGATE.