The route was extended west from Manheim to Marietta in the 1980s , replacing the entire length of PA 141 .
In the 1960s , PA 772 was rerouted to head to its current eastern terminus in Gap .
The route was extended west from Manheim to Marietta in the 1980s , replacing the entire length of PA 772   .
In the 1960s , PA 772 was rerouted to head to its current eastern terminus in Gap .