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I should also mention that rev matching is required but that should already be common knowledge.
And another but of info: the large the rpm delta the more the synchros will have the speed up the transmission shaft to match rpms, and this speed up happens very quickly hence alot of inertia to overcome. So the larger the rpm the larger the torque on the synchros thus the larger the load and more strain hence the lockout and high rpms. So when you do it at very low rpms and low speeds the stress on the first gear synchro is alot lower and equal to what other synchros would experience. Hence it's safe to do so because first gear is not special in anyway to the other gears.
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