Clutch Pedal Very Stiff

[BrandonOlsen]

Hello! New here and seems to be a lot of helpful info on here!
I have a 2018 579 Peterbilt X15 Cummins Efficiency Series 500hp. Originally a 9 speed and converted to 13 speed. Yesterday I went to the washout to get my trailer washed out ( Cattle Pot) . Got done and started the truck up and when I went to engage the truck the clutch was very stiff, never felt a clutch so stiff in my life. So I pulled up 100 ft and stopped. Went to engage the clutch to take off and it was still very stiff. I thought I could hear a grinding type of noise so I figured my clutch was fried. Get home which is 6 miles from the washout and clutch is still stiff and still hearing grinding/rattling noise. So I called the shop I use to get it in today. This morning started the truck and let it warm up for 25 min before taking off to the shop and when I went to engage the clutch it wasn’t stiff anything like it was yesterday. Still stiff but nothing compared to yesterday. Also, this morning I didn’t hear the grinding/rattling noises that was there as well. Truck did seem to shake a little bit in lower speeds 0-20mph. Dropped truck off at the shop and waiting to hear something but just trying to make sense of this. Did pull the cover over and will upload video of it. Also notice coolant line going to trans cooler had a leak at the clamp. Seemed like around the house at the clamp was red sludge. At the same time I noticed oil on the top side of the transmission and shift tower. The actuator for the hydraulic clutch was replaced a month ago as it had a small leak out of the bottom of the actuator. Look forward to engaging with the members on this forum!