We built Dereks ZF about 9 years ago, he added the air shifter but still has the same problem of a single cone synchro ring, that still grinds at shift because one ring can't slow the gear down fast to engauge at the speed you need for the squential set up, Howstuffworks.com is a great way to see how a dog ring box in a race car works, (dog rings are a 6 cog ring that not synchro)
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