1985 Chevrolet C10 Suburban Differential Spool GM 8.5 in. - w/ 10 Bolt Cover - 30 Spline - Spartan Locker - Installs into standard open carrier case - Rear guaranteed to replace your current 1985 Chevrolet C10 Suburban Differential Spool GM 8.5 in. - w/ 10 Bolt Cover - 30 Spline - Spartan Locker - Installs into standard open carrier case - Rear. 1985 Chevrolet C10 Suburban Differential Spool comes new OEM 1985 Chevrolet C10 Suburban Differential Spool aftermarket new 1985 Chevrolet C10 Suburban Differential Spool of remanufactured 1985 Chevrolet C10 Suburban Differential Spool GM 8.5 in. - w/ 10 Bolt Cover - 30 Spline - Spartan Locker - Installs into standard open carrier case - Rear.