An original '42 2-spd rear would have ratios of 5.64:1 and 8.22:1. If you can find the serial number stamped on top of the unit just ahead of the shift lever, it should have a prefix of 2AB or BV, if it's original.
Curt ---- 1953 Chevy 6400, 1957 Chevy 2dr Sedan --"Mediocrity is easy, the good things take time"
