I think this is a bad motor but im not sure. Just tonight all of the sudden the rear started sounding different. Its still lifting, but just doesn't sound the same, it doesn't have the same "whine" like it did before. Its only on 24v so its not quick anyway. I did have that motor on the front at 48 for the first 8 months then switched em around about 4 weeks ago. Does it sound like the motor is going out?