I am new to this forum. I too am a trooper owner and have one of the first ones off the line. I have spend more time working on my buggy then driving it. I have done many changes too, most are the same problems as the rest of the trooper owners. One of my main complains is that the dealer I purchased my trooper at does not give me any support. I'll ask about a problem and he more or less tells me that no one else is having the problems, but when I go to Joyner they give me the part for free to repair my trooper. My trooper only has 2300 miles on it and I have street tires on it. All my miles are on the pavement or on a good logging road. I do not drive my trooper as if I stole it. Mostly on logging roads in BC Canada. I use my trooper for hunting and site seeing. I am sure I am not the only one having heating problems while driving at a rpm over 3500 rpm. I am putting a oil cooler on it as I speak. I am now getting a lot of slack in the rear end. My front drive shaft york is very loose on the spline. I will be going to Joyner next week to see what they will do for me. They have given me replacement parts such as a rear drive shaft, all new braking system, clutch linkage , rear fenders. So far Joyner has treated me pretty decent. We will see what happens. I,ll let you know. snowbird