The 81 300D does NOT have the servo II setup.

The 81 300D climate control is just like the 82 and above like the SD too.

My underhood experience on both was that the 81 has the newer climate control
but still had the older style cruise control, and non-turbo motor.

So the 81 is a change-over year , sort of a hybrid.

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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