no reverse on 1997 Chevrolet Suburban 1500

i have a 97 suburban 6.5d i have no issues wi th the forward gears but wi the the vehicle running theres no reverse or neutral gear the truck wants to go forward in all settings including neutral it happened after a severe cold snap ..any advice would be greatly appreciated..thanx

Asked by for the 1997 Chevrolet Suburban 1500
What did you find was the problem with the transmission? Did you need a new transmission?