1970 axle codes are stamped on the bottom left or right axle tube.

CGD Positraction (2.73)
CCH Positraction (2.73)
CCD Positraction (3.07)
CCP (2.73)
CCA (3.08)
CGA (2.56)
CGC (2.73)
CGF (3.08)
CGG (3.36)
CGB Positraction (2.56)
CGI Positraction (3.36)
CCN (2.56)
CKD (2.73)
CCX (3.07)
CCW (3.31)
CKJ (3.55)
CCO Positraction (2.56)
CCF Positraction (3.31)
CKF Positraction (3.55)
CKK (4.10)
CKC Positraction (2.73)
CCE Positraction (3.08)
CRJ (2.56)
CRK Positraction (2.56)
CRU (3.31)
CRV Positraction (3.31)
CRW (4.10)