Good day Cub Cadet folks. My 1811 Hdro has a lot of hours on it but still preforms with style. My concern is the loss of consistent speed when going up and down grades. Going up it slows and down it increases. When leveling out, it returns to the set speed. I'm not familiar with how the tranny works and would like some advice as to what I can do to fix the issue. I have changed the oil and filter, but that did nothing to change the issue. Any help would be appreciated. Thanks.