GMC C-Series 2001 Owner's Manual page 13

Seatback Adjustment
- -
Fore and Aft Adjustment
1-6
To tilt the seatback, turn the
backrest tilt knob. The knob
is located on the lower
cushion, on the outboard
side of the driver's seat and
the inboard side of the
passenger's seat.
To slide the seat forward or
backward, move the lever
toward the passenger's side.
The seat will lock in at
1/2 inch (1.5 cm)
increments. The lever is
located underneath the seat,
in the front.
- -
Chugger Snubber Lock
Move the handle down to isolate any backslap
experienced while in tractor/trailer operation or while
operating a dump truck application. This is only
-
available on low back seats.
Out Feature (If Equipped)
If your vehicle has this
feature, the handle is
located on the lower
outboard side of the driver's
seat and the inboard side of
the passenger's seat.