T56 Conversion

Was researching this also, on the T56 wiki ( Borg-Warner T-56 transmission - Wikipedia) it looks like vettes and f-bodies were 27 spline, and newer heavier T56s were the 31 spline, also "read" just online somewhere though, that the torque ratings of the transmissions were subject to certain components and could be rebuilt with with stronger parts, making the 27 splines more reliable up to the 450lb ft range?