New Clutch, slipping sometimes in high gears

I believe you have an underlying problem that no one is picking up on. The forks can get worn down 2 or 3 ways. (1) The driver rides the clutch and doesn't take his foot off the pedal. (2) The clutch isn't kept adjusted and is run without any free play causing the fork to be always against the throw out bearing.(3) The throwout bearing isn't greased often enough and doesn't slide on the input shaft the way it should.
As far as the clutch not lasting it can be the result of buying reman clutches and not new. There are many other possible causes. The truck needs to be looked at by a competent mechanic.

 

Is the clutch hydraulic or air operated?? If so I would be looking at that side of the system since you said it stopped working when cold.

 

I have no idea,what the problem is, but from the pics as ridgeline said, it looks like they didn’t replace the pressure plate, I doubt they replaced the clutch at all. That would explain everything. Since new clutch comes with new pressure plate.You heard the seller agree to it, yet he sold the Truck. You bought the Truck. Everyone else agreed it needed clutch. By the looks of that Pressure plate, clutch and forks, none of it was replaced. 1750 lb clutch was original, 2050 is a good upgrade. I put one in mine. Never a slip. It must have something to do with slave cylinder or whatever they call it. Linkage, and motor mounts are very important for proper operation. The black shavings could be anything, grease, or Probably friction pad material. That clutch wasn’t bad enough to slip. Pressure plates chewed up, but pads still have material. It shouldn’t slip, till pads are all but gone.The problem from the beginning, and still is more than likely in the linkage/ hydraulic system, not releasing. Unless it’s a self adjusting clutch, I think it needs to be properly adjusted, regardless of it being a hydraulic linkage. I’m no expert, wish I knew more. Just some ideas. You don’t want to burn up the new clutch. You got a good one now. Should last a million miles. No way you put that much wear on pressure plate and forks in 40 k miles. Even if you had your foot resting on the pedal the whole time. Don’t ever do that!!!!! Good luck, get the hydraulic linkage replaced or bad parts replaced and adjusted, after They make sure the clutch is properly adjusted. Make sure the motor mounts and Cab mounts are good. Everything needs to be in its proper place, and stay there. Once it’s right, periodic adjustments should be all that’s ever needed.

 

Delete