It's do-able for a dyi. The question is how capable are you. The problem I had when I did an automatic many years ago is all I had was a book. This was fine but when I got in there I really didn't know the little things to look for or at like you would a motor if you have been into a few motors. I felt like it was a foreign language. I did what the book said and it worked just fine. I dropped it on a Friday, rebuilt it on Saturday and drove it on Sunday. I was pretty proud of myself.

If there is any way you can talk with a professional that knows them or maybe he will even show you what to look for you would be a long way ahead. Not alot of people do automatics so thats why I did mine. To see if I could. Good luck. Thanks

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83 300D 227,xxx miles, sold
86 300 SDL 130,000 miles, sold