The best guy in SO CA is Transmeister in Orange. MB transmissions only. Only uses factory parts. First cabin, end of story.

The rest of the guys aren't.

I don't own an SD and never had but the kickdown switch is the only electrical item for the transmission (could be wrong). The balance of the transmission is controlled by vacuum, a single cable and levers. What else does the #10 SD fuse control?

Likely there are other issues that are appear to magically fix themselves by disconnecting the magical #10.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)