I found a 84 300d gc 4 door in a garage at a house I was working on it had sat for 4 years, to make a long story short the owner gave it to me for a little extra work on the house, after sitting that long all I did was free up the brake calipers and put a new battery in and drove it home, the 1st gear on the tranny was bad due to a vacume leak, and other small things have gone bad such as the brake lines rusted out and air compressor and the front end needed work, the car has 190k on it now and I still drive it every day, ( I have some air conditioning issues) but everything seems ok considering the year and Michigan winters.

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1984300D 190,000 miles used everyday