Okay, yesterday I parked my truck, set the brake and left it in 2nd gear. I went in to a store, came out and started the truck. I was sitting there with the clutch depressed to the floor unwrapping a sandwich I had bought and all of a sudden I hear a slight noise and the truck tried to go even though I still had the clutch fully depressed. I couldn`t get it out of gear so I shut it down. I restarted the engine in neutral, shifted into 2nd gear, no problem, drove it home (made 2 other stops no problem). I put it in reverse and when I started to back into my parking spot, the clutch engaged with the pedal about 1/2 inch off the floor board and when I depressed the clutch it made no difference, again I had to shut down to stop the truck. It seems to be doing this intermittently, any ideas as to what has gone wrong? Throwout bearing maybe?

 

more likely your clutch hydraulics are leaking. check the fluid level, and check around the master and the slave for leaks.

 

I checked the fluid level, all is good there.

 

If hydraulics are good. Possiable weak pressure plate. Or it may just be time for a clutch.

 

may have fingers broken or bent on the pressure plate then. I have never seen a throwout fork bend, they are way too heavy duty to bend, even with a heavy competition clutch, and throwout bearing can't go anywhere...its around the input shaft.

probably time for a new clutch.

I still think it's your hydraulics though.

 

It`s weird, it seems to be intermittent, I drove it to the store yesterday and it was fine until I got home and started to back into my spot, then when I started to release the clutch pedal, it moved maybe a half inch and engaged the tranny. Had to shut down, shift to neutral, start it and shift into reverse again and it was fine. The is NO noise of any kind. I just took it up the hill, back it around, then took it on the road and came back and no problem. I don`t get it. If it was hydraulics, wouldn`t there be a loss of fluid?

 

Sounds like the throwout bearing is going away. No Matter what, if it isn't the hydraulics, it time to pull the tranny

 

throwout bearings going out usually make nasty noises though... you can always pull the slave and use a mirror and light to try and take a peek in there, but most likely will have to drop the transmission which you NEED a tranny jack for. NV5600 is too damn heavy to try and man-handle. that tranny weighs a good 450lbs+

 

At 100k miles my clutch went bad. I bought and had a Pheonix organic clutch installed rated at 480 HP. Looking at the used parts, the clutch looked great with plenty of surface left. The dual mass flywheel failed completely. Definitely go with a single flywheel. Second consideration! The G56 tranny is designed by Mercedes to operate with 50 weight synthetic oil. The use of ATF 4 is Chysler's gift of screwing their customers. My tranny was getting cantankerous on shifting. I had the ATF drained and replaced from the top shifter with 7 quarts of Mobil Devcon tranny oil. Now it feels and shifts perfect!

 

He doesn't have a G56. his truck is a late 2nd gen, so it has a NV5600 which takes syncromesh 5w-30 MTF.

G56 is also rated to take synchromesh 5w-30 and many have reported shift improvements.