1985 Chevrolet K5 Blazer Differential Spool 4WD - GM 8.5 in. - w/ 10 Bolt Cover - 30 Spline - Spartan Locker - Installs into standard open Carrier case - Front guaranteed to replace your current 1985 Chevrolet K5 Blazer Differential Spool 4WD - GM 8.5 in. - w/ 10 Bolt Cover - 30 Spline - Spartan Locker - Installs into standard open Carrier case - Front. 1985 Chevrolet K5 Blazer Differential Spool comes new OEM 1985 Chevrolet K5 Blazer Differential Spool aftermarket new 1985 Chevrolet K5 Blazer Differential Spool of remanufactured 1985 Chevrolet K5 Blazer Differential Spool 4WD - GM 8.5 in. - w/ 10 Bolt Cover - 30 Spline - Spartan Locker - Installs into standard open Carrier case - Front.