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Ferrari 330 GTC transmission

What would cause the shift lever to move forward and backward upon decelerating and accelerating? I am not talking about a 1/4″, more like 1-2 inches. The transmission was quiet and the ring and pinion are totally silent so it could not be the pinion shaft cluster that was loose.

We pulled the trans-axle and something very unusual happened, we found a simple problem that required a very simple solution! The forward most ring nut on the main shaft was loose and it did not do any damage to the rest of the gears or bearings. With this nut loose, the selector rings were moving which made the shift lever do the voodo dance.

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