12E help

Hello , I purchased a 12e a few years ago and its
treated me well . The previous owners used it for snow pushing , I’ve never used it in the winter . Last fall I roaded it 15 miles to a different farm yard with no issues . When i arrived at the farm yard , I went to shift into a lower gear and had issues . In certain forward gear it sounded like it was going to kill itself and I pushed back down on the clutch . After playing with it , I could only get reverse to work . I backed into a spot and called it a year as winter had set in . Can anyone have some guidance what might be the issue ? Do I have an internal damage ? Did something come lose ? Thanks guys