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I recently replaced the gears in the gearbox for my 1962 28 HP. Evirnude. I brought it out on the water, and it ran fine until I throttled it up past the slow idle speed, and I lost forward. I could go into reverse, neutral, but could not go into forward. Unless I slammed the shifter forward, but then it would fall out of gear. I opened up the gearbox and nothing is damaged. What could the issue be? Thanks for the help!

