My '67 K10 has spicer lockouts. Bar going thru the middle. Cool thing about those is there is no direction in which you have to turn to lock and unlock. Half a trun any direction locks (you will notice that bar feels as if there is no pressure). To unlock Half a trun any direction unlocks. All you hear is a click. Its either locked or unlocked depending on the arrows on the outer portion of the lockout. The only problem I have had with these is sometimes they get twisted (when trying to unlock)which means I pull the snap ring off and remove the hub reallign the pins and bata bing bata boom I'm back in business. For what its worth enjoy!!
