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I think what you want to do is this: at 60mph in 6th push the clutch in, pop into neutral, let the clutch out, rev it up to 6000, push the clutch in, put into 3rd, let the clutch out and get on the gas at the same time. I think that will spin the internals up and put no extra load on the 3rd gear synchro. make sense?
If you were to double clutch but not rev it up to 6000 until after you depressed the clutch for the second time I think it would still put a large strain on the synchro because then it would be spinning at a much different rate than the output shaft when you do rev it up to 6000.
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