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I too have an 87 Grand Marquis. I had that happen on the drivers side front window. The plastic motor bushings probably turned to goo like they did on mine. It’s a pretty common problem. You’ll need one of these kits.
www.1aauto.com
You don’t necessarily have to buy from them but just to give you an idea. You will also have to drill 3 holes to get the motors out. It’s not hard though.
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Ford Lincoln Mercury Window Regulator Gear Repair Kit TRQ WCA50125
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You don’t necessarily have to buy from them but just to give you an idea. You will also have to drill 3 holes to get the motors out. It’s not hard though.
Sent from my iPhone using Tapatalk