If you split the valve body, there is a chance of check balls and springs going every where. To replace the clutch discs, the only special tools needed are a good snap ring plier set. Not the cheap all in one set sold at the local parts house and a good set of picks and a digital camera to take lots of pictures. Take a picture of everything you do, so you can put it back together.
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Dave
1983 300D Daily Driver
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