1988 Toyota 4 Runner Differential Spool Toyota V6 - 8 in. - w/ 30 Spline Axles - Spartan Locker - installs into standard open carrier case - uses stock side gears - Rear guaranteed to replace your current 1988 Toyota 4 Runner Differential Spool Toyota V6 - 8 in. - w/ 30 Spline Axles - Spartan Locker - installs into standard open carrier case - uses stock side gears - Rear. 1988 Toyota 4 Runner Differential Spool comes new OEM 1988 Toyota 4 Runner Differential Spool aftermarket new 1988 Toyota 4 Runner Differential Spool of remanufactured 1988 Toyota 4 Runner Differential Spool Toyota V6 - 8 in. - w/ 30 Spline Axles - Spartan Locker - installs into standard open carrier case - uses stock side gears - Rear.