Mower: 1998 Toro proline model 30197 48" T-bar fixed deck 15hp Kohler 5-spd gear drive. Notes: Brand new wheel belts on both sides, brand new trans belt. Transmission less than a year's wear on it, engine almost new, both side pulleys from the trans shafts and the 9-spline couplings less than 2 years old, brakes replaced in January. What it is doing on the LEFT side I am getting very little power to the wheel. The belt spins fine but it's almost like it's slipping on the wheel pulley or like a brake is dragging or something... The right side is dandy I hardly give it any bar and it about spins the tire but not so on the left... I first replaced the new belt on the left side with another one just in case, still the same problem. It works all right on level ground but I can kind of feel it there, but get into a hilly section and I have to squeeze that T-bar to where the torsion bar bends and still it almost won't move! I have to get off the velke which is not unusual on a hill fine but then PUSH that POS to get it to act right. I inspected this to no end, the brakes appear to release fine on both sides, I can jack the back of the Wb up and rotate either tire by hand with about the same force in freewheel mode... I even pulled the wheel off to inspect the washer locations and all that is fine... It's driving me nuts... Any ideas on what it could be?