Hopefully someone can shed some light on this noise that I am experiencing. The stumpy r380 transmission and transfer case are around a year old with low mileage on them, both from Ashcroft. I recently changed my clutch to a heavy duty one from LOF. The install went without a hitch and around 50 miles later what I think is the transmission started to make a whining noise that got progressively louder the longer I drove it. So I started troubleshooting and changed out the fluids on both the transfer box and the transmission. Took it for another test drive and the noise is still there. The noise does go away when in neutral and is present in all gears. I pulled the PTO plate off and took out the input gear and found nothing out of the ordinary. I don't know what else to check so if anyone has any ideas on what the problem may be or where to look next it would be greatly appreciated.