Replacing the shafts for the higher-powered plant

Would the shafts be replaced to handle the increased shaft horsepower?

Yes. The design assumes four shafts, allowing the new output to be distributed more widely than on the two-shaft comparisons.

The higher-powered conversion would receive replacement shafts. The assumed four-shaft arrangement distributes the output across more shafts than the two-shaft C-class cruisers and destroyers used for comparison. It is also expected to spread the resulting strain over the hull. The conversion depends on that four-shaft interpretation of the original machinery.