Changing the shocks requires an alignment of the rear wheels, and also an ELC adjustment. The new shocks may have put him near the limit of the range, causing it to vent when he gets out.

When I replaced my rear ELC shocks, I made my ELC adjustment on the lift before they did the alignment.

As the 2000+* use shocks in the rear, and not struts, changing them does not require an alignment like the earlier years. Also, there is no easy way to adjust the ride height. The shaft for the sensor does not have an adjustment link, and the sensor itself has a tab that slips into the frame for proper positioning.