Brian, I put that 54GT deck on the 782 about 8-10 years ago. It is the single best modification I have done on that tractor. I know I had to make a few changes to hang it on the sub frame, but once mounted it has plenty of lift to mow in my horse pasture and not hit rocks.
I also installed a super steer axle and power steering from a later model tractor. It makes a great mowing tractor.
I believe Steve Blunier also put the same deck under one of his 782s a few years ago (before he got the doodlebug). I think his tractor has the factory axle so the super steer shouldn't be needed with the 54 inch deck.
I will say though, you need to have stock rear tires with this deck. There is not enough clearance between the deck and tires to have anything larger.
I also have to use a floor jack to raise the front of the tractor when I roll the deck under while mounting. There isn't enough clearance to slide it between the front and rear tires without lifting them 6-8 inches off the ground.
I also installed a super steer axle and power steering from a later model tractor. It makes a great mowing tractor.
I believe Steve Blunier also put the same deck under one of his 782s a few years ago (before he got the doodlebug). I think his tractor has the factory axle so the super steer shouldn't be needed with the 54 inch deck.
I will say though, you need to have stock rear tires with this deck. There is not enough clearance between the deck and tires to have anything larger.
I also have to use a floor jack to raise the front of the tractor when I roll the deck under while mounting. There isn't enough clearance to slide it between the front and rear tires without lifting them 6-8 inches off the ground.