What could be cause of not going into reverse or drive? on 1997 Chevrolet Suburban 1500

Less than a month ago we had the reverse clutch repaired on the transmission because it would not go in reverse. Been driving a month with no further issues until today. Just had motor replaced 3 months ago along with new power steering pump and the transmission issue. Please help! My son is stranded in Pennsylvania with no ride.

Out of warranty for trans repair?