I'm new to tractors and I'm running a front mount snowblower, chains on rear tires and rather than keep the diff. locked, I'm using the 4X4. I have a B2650 with hydrostatic transmission. I just watched a youtube video of a guy named GP in Canada that said his dealer told him he can't use chains and 4x4 at the same time as it will destroy the transmission. Any validity to this?