Have a chance to pick up a cheap ($400) 300D with what I think is a fixable tranny problem, leaky vac system, no shut off key, etc, how tough to put it in my crappy running, metal part dropping bad shifting tranny 300SD? I have access to an engine hoist and some wrenching buddies. Tough topic to search, getting lots of off topic hits....

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'84 300SD veg-oil bliss
'83 300SD veg-oil beater