My only reason for posting the chart was to illustrate that with the T-10 it is incorrect to assume all first gear ratios have the same torque capability. But that aside, I have to admit that the progression of the T-10 has been confusing for me. I am under the impression that the original T-10 was in production up to about 1965. Then the first version of the 'super' T-10 was introduced and was in production up until about 1975 when the second version of the 'super' T-10 was produced. But I could be wrong on that. I've been wrong before.