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"Double-clutching is another abuse; a fully synchronized transmission in good working order for street-driving does not need it."
Abuse?
Gunter,
I concur with Allen. Double-clutching (done properly) rotates the to-be-meshed parts at the same approximate speed. The closer they are in rotational speed before meshing, the less the synchromesh has to work in order to match the speeds. Conversely the more the synchromesh has to work, the more wear it'll have.
Have you ever tried downshifting into 1st at 15 mph w/o double-clutching. I's a difficult task using just the synchronizers due to their inefficient design. Not bragging, but if needed, I can do it by double-clutching. What does that tell you about the process?
YMMV,
Sherwood
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