Glide shift transmission

[Rlandrum]

I have had my L4650 for ten years with only 1,238 hours on it. Just recently I noticed when I shift from neutral to forward or reverse on the column shifter that a slight noise is heard that sounds like fluid rushing through a line. I really don't how to better describe this but it happens when I also shift from one gear to another on the left side. I wish I could better somehow better describe the noise? Never had this problem before and does anyone know what I should look for?

Thanks,

Rod

 

[Bulldog]

When's the last time it was serviced?

 

[North Idaho Wolfman]

So is the only issue the sound of the rushing fluid or is there something else?