 In 1946, however, PA 37 was realigned to follow the entire alignment of PA 434 from US 6 to New York, decommissioning PA 137 in the process.PA 37 remained in existence until 1967 when PA 37 was replaced by PA 434.In 2004, State Route 434 was extended from its southern terminus down to an intersection with State Route 739 in Lords Valley.