Possible you bumped the selector out of neutral when you changed over. I do not remember but if you go all the way back with the lever and are in first (forward) gear, go 3 clicks up and you are in neutral. Ensure you have the shifter mounted in neutral.
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.