Galen's numbers on the '70 Challenger R/T (JS) line seem to be missing some info - I'd bet the source info was difficult/impossible to read.

it looks roughly like (combined for all E74, E86, E87 w/4-speed):
JS23 (60% 3.54 & 40% 4.10)
JS27 (50% 3.54 & 50% 4.10)
JS29 (65% 3.54 & 35% 4.10)

JS23U0 auto & 4.10s ~ 137
JS27U0 auto & 4.10s ~ 5
JS29U0 auto & 4.10s ~ 30

JS23V0 auto & 4.10s ~ 314
JS27V0 auto & 4.10s ~ 13
JS29V0 auto & 4.10s ~ 67

JS23R0 auto & 4.10s ~ 96
JS27R0 auto & 4.10s ~ 0
JS29R0 auto & 4.10s ~ 19