another thing to try is the rack dampener bolt behind the IP. it can be adjusted and ultimately replaced. at one point (i think 84 ish) they upgraded from a 'silver' to 'gold' one which was an improvement for all previous models.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car