Phase One (early 77 into spring 79)
length 58'4"
wheelbase 36'2"
front pilot to front bolster 11'1"
rear pilot to rear bolster 11'1"
Phase Two (spring 79 to fall 80)
length 58'4"
wheelbase 37'2"
front pilot to front bolster 11'1"
rear pilot to rear bolster 10'1"
Phase Three (fall 80 to end of production)
length 57'4"
wheelbase 36'8"
front pilot to front bolster 10'6"
rear pilot to rear bolster 10'2"