Which parking brake does your SM420 transmission have, the dual shoe (used on the big trucks) or the single external band type (used on the 1/2 to 1 ton trucks)?
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD