Hey THANKS Brent77!!! I just wasn't sure since the 1987 Suburban I restored now has manual locking hubs and I remember my old 1994 Suburban 4X4 (241C transfer case) had no provisions for any manual locking/unlocking of the front hubs. Now I remember the 94 4X4 front axle had a gas charged device that would expand out and lock the front differential when moving the floor 4WD lever into 4WD. I noticed the cast iron transfer case adapter for the 4l60E-241C set up is the same cast iron case adapter as the 700R4-208C set up. But I am curios as to how many different case adapters (Aluminum/cast iron) were used between the Blazers and Suburban's on the square body's, just food for thought. Rock on Chevy's!!!!!