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Discussion Starter #1
I have a 1967 289. I bought my mustang last summer and it has been running great until two days ago. All the gears seem to work but when I put it into Drive it doesn't seem to shift in gear once I begin to drive. I checked the transmission fluid as seemed okay.

Any suggestion of the problem?
 

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Does it start in first and then not shift? If so, follow your vacuum line from the intake all the way to the trans. Looking for cracks, breaks, or unplugged. Vacuum makes the trans shift.
 

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Everything in the car completely seems normal. When I begin to start down the road and hit around 20mph, when it usually shifts into gear it doesn't shift....so maybe the vacuum line? Thanks!
 
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