Assembled in the USA Toyota V6 Yukon Spartan Locker 30 Spline SL TV6-30 Rear | SLTV630 | Aftermarket Branded | 30 100% Lock Differential For Dana 60, 30-Spline, 4.10 & Down Yukon Grizzly Locker The Yukon Grizzly locker is a mechanical locking differential that features a forged case and 8620 internals for maximum strength. It's patented design reduces... Assembled and quality tested in the USA, the Grizzly Locker is trusted in off-road and drag competitions around the world., 1 Year Warranty , 8620 Steel Internals Yukon Grizzly Locker for Ford 8.8, 28-Spline Yukon Grizzly Lockers are high performing mechanical locking differentials crafted from the exceptionally strong metals.