They are saying that one synchronizer works with a 1st to second shift, and a different one works from 3rd to 2nd. Not sure the significance, but that's how I read it.

Yes, you must be in neutral at some point during any and all gear changes.




•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-