GMC 2003 C4C042 Owner's Manual page 13

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Chugger Snubber Lock
Move the handle down to minimize any backslap
experienced while in tractor/trailer operation or while
operating a dump truck application. This feature is only
-
available on low back seats.
1-6
Out Feature (If Equipped)
If your vehicle has this
feature, the handle is
located on the outboard
sides of the driver's and
passenger's seats.
Reclining Front Seatbacks (If Equipped)
If your vehicle is equipped with bucket seats, you can
recline the seatbacks. The lever is located on the
outboard side of the seat cushion.
To recline the seatback, lift the lever and use your body
to move the seatback. Release the lever to lock the
seatback where you want it. Lean forward and pull up
on the lever to return the seatback to an upright position.