I wasn't aware that the 312 & 312B had different axles and axle housings, but the parts manuals clearly points out that is the case. I took a look at the axle housings or my 312 and my 351 and they too are different
Do you know if the diameter of the 312 axle is larger than the 311? I don't have access to a 311 to measure.
Thanks a million for pointing out these differences. I always learn something new here. - Joe