2008 Chevrolet Tahoe Owner's Manual - Page 73

If the position you are using does not have a headrest or head restraint and you are using a single tether, route the tether over the seatback. If the position you are using has an adjustable headrest or head restraint and you are using a dual tether, route the tether around the headrest or head restraint. If the position you are using does not have a headrest or head restraint and you are using a dual tether, route the tether over the seatback. If the position you are using has an adjustable headrest or head restraint and you are using a single tether, raise the headrest or head restraint and route the tether under the headrest or head restraint and in between the headrest or head restraint posts. 3. Push and pull the child restraint in different directions to be sure it is secure. 1-69