use a ratchet to loosen the mounting bolt on the alternator and pivot it down. now the belt should be loose. slip the belt off. slip the new one on. pivot the alternator back into position and tighten the mounting bolt. to get an exact fit before loosening the mounting bolt make a mark across the mounting bolt and mount so you can line it up when tightning. Chev Impala 3.8 ltr 2000 and earlier. 1) Remove stabilizer bar, 2 nuts on each side on top of strut mounts. 2) Remove coolant recovery tank and recovery tube, crimp tube lightly with small pair of vise grips so coolant will not drain out. 3)Using a 1/2" drive ratchet with a 15 mm socket place the ratchet on the self tension pully bolt. Pull up on the ratchet as if you are trying to loosen the bolt ( pully bolt will not undo ) using enough force to overcome the torque of the tension spring. This procedure will push the pully down enough to slip of the serpetine belt. Reverse procedure to install new belt.