My 1984 300SD is a California car, it has the black vacuum module on the side for fine tuning the softness of the shift.
My trans is slipping (flaring?) from second to third gear, fluid and filter are new........ when I changed the oil and filter, the oil looked great and the pan was spotless,...... It shifts so smooth except second to third, Any ideas?
Thank You ahead of time!!!
Jim

PS
I was very careful not to leave any lint in the pan, I used a paper towel and brake clean.

I had the same symptoms. Changed the k-1 spring, which is easy to do. Problem solved. Drop the transmission pan, remove the filter. Remove the small plate on the valve body on the left facing back. Remove the old k-1, put in the new one and all will be well. It cost about 20.00 for the spring. Dont put it off since you are burning the bands by slipping.

Dont remove the small panel on the left. Its the small panel on the RIGHT. I was upside down on my back in my mind..... sorry

X2 for k1 spring change

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1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

The K-1 accumulator is on the front left side of the lower valve body.