3 speed auto to 4 speed auto

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hawkgoalie31

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Joined
Dec 27, 2007
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Hey Guys,

I m thinking about changing my 904 3 speed trans to a 4 speed trans in my 1974 Plymouth Duster 318. I would appreciate all the pros and cons if anyone has done this before and where I would go about getting a 4 speed. Also any info anyone has to offer. I figured this would be the best place to start researching

Thanks
 
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