I have a 87 300D auto trans was working fine came to a stop and it rev'ed up to get going. Once it kicked in went through the gears just fine, but sliped to start out again. Reverse works fine. Fluid is Mobil 1 miles 220k changed at 200k got advice to change filter again and fluid that mobil 1 may have loosend some dirt. Still no fix once you get it going it runs fin any suggestions thanks

Shift kit. all springs. do it soon before you have friction or steel damage.
there was a thread discusssing it and part numbers a few days ago.

Your b2 piston/seal broke.

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James Marriott
2003 Buick Regal
1983 300D (228k, frau Auto)
1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000)
www.engineeringworks.biz
1987 300SDL junker 170k
1982 300SD junker, 265k

Thanks fellows sorry for the late response. I'll have to find the drawing on a other post and look into it further

B2 sounds like the problem looking for the post that had the tranny diagrams in it