The Sea Ray Sundancer 340 1986 vs Sea Ray Sundancer 43 2009 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Sea Ray Sundancer 43 2009 measures 47,0 feet overall (2009), giving it roughly 11,0 additional feet of deck space compared to the Sea Ray Sundancer 340 1986 at 36,0 feet (1986). Weight tells a clearer story for trailering families: the Sea Ray Sundancer 43 2009 tips the scales at 28 500 lbs — 13 900 lbs less than the Sea Ray Sundancer 340 1986 at 14 600 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 425 hp, the Sea Ray Sundancer 43 2009 has a 105-hp advantage over the Sea Ray Sundancer 340 1986's 320-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Sea Ray Sundancer 340 1986 carries 225 gallons versus 35 gallons in the Sea Ray Sundancer 43 2009. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Sea Ray Sundancer 43 2009 is rated for 14 passengers, while the Sea Ray Sundancer 340 1986 caps at 10. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sea Ray Sundancer 43 2009 could be the deciding factor.
Bottom line: Choose the Sea Ray Sundancer 43 2009 if your priority is putting more people on the water — it handles 14 passengers and at 47,0 ft it has the deck room to back that rating up comfortably. The Sea Ray Sundancer 340 1986 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 10 that costs less to run day-to-day.