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This old review of a 1974 rounded-line Chevrolet C-10 Cheyenne Super Fleetside talks about some of the new equipment changes, including the new automatic differential lock (ADL). It even talks a little about how the rear ADL works.
The ADL was introduced as a replacement for the "NoSpin" differential and the regular so-called "Positraction" limited-slip differentials offered on GM's pickups and utilites. The locking differential offered superior tractive-effort to any limited-slip differential (LSD). Ford and Dodge did not offer anything that could match it in terms of torque transferring capability, as they only offered LSDs in their pickups and utilities. The ADL was optional on both GM’s pickups and utilities, (Blazer/Jimmy and Suburbans).
Currently, the newest version of the ADL is still available as an optional extra on GM’s pickups and utilities. It is standard (along with a few other features like underbody skid plates) with the Z71 off road package.
The ADL was introduced as a replacement for the "NoSpin" differential and the regular so-called "Positraction" limited-slip differentials offered on GM's pickups and utilites. The locking differential offered superior tractive-effort to any limited-slip differential (LSD). Ford and Dodge did not offer anything that could match it in terms of torque transferring capability, as they only offered LSDs in their pickups and utilities. The ADL was optional on both GM’s pickups and utilities, (Blazer/Jimmy and Suburbans).
Currently, the newest version of the ADL is still available as an optional extra on GM’s pickups and utilities. It is standard (along with a few other features like underbody skid plates) with the Z71 off road package.