OK, figured out that the numbers given above are on most 12 bolt rear differentials, I did find a 12 bolt axle that might swap gears, and found the correct numbers on the passenger side on the axle tube. it reads THA 32 1 and I will get the numbers off of my axle soon, but what is this ratio? I can't seem to find any info on the web of any decoding tools or charts. it is out of a 72 chevy.
1949 Dodge Coronet 1955 2nd Chevy 4400 1.5 ton 1955 2nd Chevy 3100 1/2 ton 1955 2nd Chevy 3100 1/2 ton 1957 Chevy 5400 LCF 2 ton 1966 Dodge D100 Sweptline 1968 Chevy P20 stepvan 1969 GMC LWB pickup 1972 GMC Sprint 1974 CP30 shorty bus There are three things that I've learned never discuss with people: religion, politics, and the Great Pumpkin.----Linus Van Pelt Trying to understand the behavior of some people is like trying to smell the color 9  | 
