There are plenty of posts on this very subject, some very complete
with needed tools etc.. Just search on 300D transmission.

Later when I have more time I'll try and dig up a few.

You should check into B2 piston too (again - use search).

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250