One problem related to differential unit has been reported for the 1999 Chevrolet Astro. The most recently reported issues are listed below.
02/01- differential failed, dealer estimate to repair $3000;02/01 - O2 sensor and seals failed; 08/00 - transmission failed;03/00 windshield leaks, was replaces; 03/00 rear doors leak, weatherstripping replaced;03/00 complained numerous times about front driver seat moving when brakes replaced;vehicle hesitates when gas pedal is pressed; when pressing on brake , you also press on gas pedal.