So I just brought home my 19 800xc. I changed out all the fluids and did a basic full service. I took out for a short spin today and it ran great in high gear, both 2x4 and 4x4.  Got it up to 60 mph with power to spare.  In low gear however, at around 23 mph the engine stoped making power and the rpm's cycled high to low and back.  Seems to run normal at speeds below that.  I did briefly run it in low gear when I was looking at it before I bought it, but not at higher speeds. I wouldn't think it's a clutch problem because it doesn't manifest at all in high gear.  I am planning on getting a clutch kit and new belt due to basic wear and tear. Anybody have any ideas?  The machine has 100 hrs on it. Is it a tranny issue?  Thanks

aren't you hitting the rev limiter?
If you plan on going above 23 mph i would recommend high gear