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First off, when the salesman says that the gearbox is rated for 70 HP (6' Model and 40 HP, 5' model), that means the gearbox can handle up to 70 HP and shouldn't be used on tractors with PTO rating above 70 HP. What it doesn't mean is that it requires 70 HP to run the mower. Yes, a WD45 can handle a 6' rotary mower without any problem whatsoever! In fact, if the tractor is tuned well, and your not running in too thick of brush, I'd even contend that a healthy WD45 can pull a 7' bush-hog. As for the box blade, I recently purchased a 7' Bush Hog model SBX 840 and have run it behind both my '50 WD and my '56 WD45. I am thoroughly satisfied with it, and would caution you against buying one of those cheap brand box blades if you're planning to move large amounts of earth. These tractors are powerful and pull hard and if you get that thin constructed cheap stuff, you'll bend it up quick. For reference sake, I have for several years been running a 6' Flail Mower behind the WD (just bought the 45 about 2 months ago - restoration project) through thick stuff and thin, without any problems. I've also been told that Flail Mowers require more HP than comparable sized Bush hogs. 5' Bush-hogs are commonly run behind Ford 8N's (20 PTO HP) and they are only half the tractor a WD or WD45 is! Were I you, I'd get the best built, highest quality equipment you can afford. I can honestly say that the majority of the times I've sacrificed quality for price, I've come to regret it later on down the line. (I'm learnin'...) Good Day!
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