Locking rear diff??

[FLYNAVY30]

I'm embarrassed to ask this, but I know next to nothing about rear differentials....


I've got a 1972 C20 Suburban. Rear end is a Dana 60 based on both the options list on the glove box door, and the casting on the differential housing itself. My question is, on my 2wd truck, is the Dana 60 lockable, and if so, how? I don't do any aggressive "off roading" or "rock climbing" but the truck does see a fair number of camping trips and un-paved excursions. Airing down the tires and the ability to lock the rear diff would cover almost any situation this truck will ever find itself in.

Thanks for the help,
Greg