Jim Sohl
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Regarding drilling a drain in the bottom of the differential: My '73 has a felt, or some other similar material, pad in the bottom of the differential, held in place by a wire clip that runs from the front, under the pinion boss to the rear of the case. I can't exactly recall the arrangement of the clip without taking a peek. In any case, at least on my '73, drilling a drain into the bottom would necessitate drilling through the pad. Not much of a problem for a drill, but the pad would tend to retain shavings from the drilling – not so good in a gear case. If one were to drill through the case but not the pad, well – actual draining would be a week long process as gear oil would barely seep through the pad. Again, this is true for sn11210 and I have not seen the inside of any other JH differential.
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