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Consider cruising at 60 mph and preparing for a pass. I skip down into 3rd. I never do it without double-clutching because I intend to keep my car on its original transmission for as long as possible. A 6-3 downshift puts a tremendous strain on the 3rd gear synchro unless double-clutching and allowing the primary side of the transmission to sink into mesh rather than pushing hard on the gearshift forcing the synchro to spool it up.
Done properly, it takes zero effort to engage 3rd gear and a passenger will get zero whiplash from the manoeuvre.
Done improperly and especially if in a turn, it can make for a dangerous situation. Downshifting mid-turn is considered terrible technique but sometimes it has to be done.
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