Depending on the year of manufacture, the mounting points may differ.
Front bumper
-open the hood.
-remove the turn indicators under the headlights.
-Unscrew the screws, release them from the latches and remove the radiator grille.
-Unscrew the two bolts that attach the bumper to the spars (twisted from top to bottom).
-Unscrew the screws in the wheel arches.
Rear bumper
The bumper is easier to remove together with the amplifier.
-from the bottom side, we Unscrew the nuts that attach the bumper amplifier to the body.
-the bumper is attached to the amplifier with screws, pistons and latches.
How to remove front and rear bumper GMC Savana(1996-2002)