[69gumby]

I found some axle codes. The code is stamped on the top passenger side axle tube. The code on my rear end reads HB 03 25 W. The HB is the gear ratio, 03 is the month it was built and the 25 is the day. These codes are for the
C-10 series.

HB,LL,RA.TR,TT,TU are 3.07s

HA,HJ,HQ,MF,TQ,MI,MK are 3.73s

HK,HL,HR,ME,MG,TS are 4.11s

HC,HN,MU are 3.73 Posi

HO,HP,JQ, are 4.11 Posi