“Land Cruiser gen 3” usually means the 3rd-generation heavy-duty Land Cruiser, which is the 40 Series (J40) — the iconic FJ40/BJ40 era. Toyota itself calls the 40 Series the third-generation Land Cruiser, introduced in August 1960.
Toyota Land Cruiser (3rd generation) — 40 Series / J40
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Also known as: FJ40, BJ40 (and other wheelbase/body variants)
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Production: commonly cited 1960–1984 (with extended local production in some countries, e.g., Brazil)
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Chassis/layout: body-on-frame, selectable 4WD; offered in multiple wheelbases and body styles (SUV, pickup, cab-chassis, etc.). Toyota notes short/medium/long wheelbases and an added 2950 mm pickup/cab chassis in 1963.
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Engines: widely offered with Toyota’s F/2F petrol inline-six and B/H diesel families depending on market and year.
Quick note (why “gen 3” can be confusing)
Some people use “gen 3” for Prado (J120, 2002) instead (light-duty line).