GMC 2003 C4C042 Owner's Manual page 12

Seatback Adjustment
To tilt the seatback rearward, turn the knob
counterclockwise. Turn the knob clockwise to
tilt the seatback forward.
The seatback adjustment
knob is located on the
inboard side of the driver's
and passenger's seat
cushions.
- -
Fore and Aft Adjustment
To slide the seat forward or rearward, move the
lever toward the driver's door. The seat will lock in
at 1/2 inch (1.5 cm) increments.
- -
The fore and aft adjustment
lever is located underneath
the seat, in the front.
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