I believe this has been covered.
The two 3/2 valves ALSO produce HIGH vacuum when switched at closed throttle to get rid of this exact problem, clunky downshifts. Read the MB grey books, it's in there. If they leak or such, it'll foul things up. Also see willrev's recent post(s). The dealer replaced his, after the first two done by and indi were defective. Fixed it right up...

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One more Radar Lover gone...
1982 VW Caddy diesel 406K 1.9L AAZ
1994 E320 195K