Greetings, kendogg. I'm a recent 300 (TD though, not a D) owner too so I can't offer much advice-wise as I'm in the same boat as you. Mechanically mine is in good shape however I do look forward to the replies to lead me in the right direction in the future.

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)