I have 2 champ style QC. One is a Hildebrand, in my truck and a winters in my roadster. I put the helix's cut gears in the winters and is very quiet. The truck was really noise with straight cut gears so I started asking around to my friends that have them. What they told me was you can make a set of straight cuts as quiet as you like.operantly it is all to do with the centerline of the pinion and the main shaft. They are not all the same. It only take s a few thousands to make a huge difference on noise from the spur gears. I bought 3 sets of gears from Winters all the same gear ratio. They all sounded different when installed. One set was perfect for the noise I wanted. You can have a quiet Quick Change.
Ken