just wanted to close the loop here. i adjusted the valves and road tested the turbo pressure. neither made any difference in the slippage during 1=>2 shift. i will note that although i hadnt noticed it until it was fixed, it WAS taking a while for it to shift from R to 1 as well. i left the trans in place, dropped the pan, and pulled out the B2 piston. sure enough, it came out as several pieces. for good measure, i also replaced the K1 spring while i was in there, refilled all, and the trans now shifts like new. always great to have $150 in parts fix what would be >$1000 component swap!

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Ed D. (dafuzball)
Geneva, IL
1984 300SD (W126.120, OM617.951, 722.303, Anthracite Gray)