2nd Gen Non-Engine/Transmission Does This Sound Like A Smoked Clutch ?

[Big Best]

My truck is a 2000 5-speed 24-valve, and if start coming down through the gears as I let the clutch out (down shifting) I here a squeal. I can make the truck make that sound over and over by just coming down through the gears and kinda dropping the clutch. ( I don't drop it normally I was just trying to figure out where the sound was coming from) It doesn't do it as I shift up and let the clutch out, only during down shifting. Is this a clutch that is going out? I thought it may be the u-joints It also seems to rattle at speeds up to 35 to 40 mph. after that say highway speeds its smooth as silk.

 

[terrywerm]

First, I doubt that it would be your u-joints making the squeak. Usually if u-joints are bad you can feel a shaking or odd vibration in the shift lever while accelerating or decelerating (manual trannies only).



Does the noise seem like it's coming from down by your right foot, or does it sound like it may be further forward in the engine compartment?? The reason I ask is because I know of a similar case where the belt tensioner was not working correctly, resulting in the belt squeaking when downshifting and letting the clutch out quickly. If that is the case, you should also be able to duplicate the problem by simply sitting in neutral and stomping on the throttle pedal to bring your RPMs up quickly, causing the belt to slip.

 

[NoSeeUm]

Any clutch slipping I have ever heard, made almost no noise. If it did the noise was more like a clattering sort of and only when trying to start or hard acceration. Thats unless you have gone clear through you pads and are metal to metal, but I would think that it would make sound under acceration as well more noticeable.



Pilot bearing maybe? Sounds like maybe Terry has some good advice.



Jim

 

[terrywerm]

Any clutch slipping I have ever heard, made almost no noise. If it did the noise was more like a clattering sort of and only when trying to start or hard acceration. Thats unless you have gone clear through you pads and are metal to metal, but I would think that it would make sound under acceration as well more noticeable.



Pilot bearing maybe? Sounds like maybe Terry has some good advice.



Jim

I agree with Jim - anytime I've seen a clutch slip it has been quiet, no noise whatsoever.



Pilot bearing would be possible, and a good indicator of a pilot bearing problem is if when sitting still you push in the clutch and try to put it in first gear. If it is hard to get into gear, the pilot bearing is dragging enough to keep the input shaft spinning, making it difficult if not impossible to slide into the lower gears.



I had briefly thought about the throwout bearing, but if it is bad it will usually sound rough or noisy anytime you apply pressure to the clutch pedal.

 

[jelag]

OK... pilot bearing noise only happens when the input shaft of the transmission and the flywheel are moving at different speeds... . if your foot is off the clutch pedal than its not a pilot bearing... . clutches don't slip under deceleration as there isn't enough power applied to make them slip..... if you clutch will slip on acceleration than it can slip on deceleration..... I also agree. . clutch slipping usually won't make noise unless your metal to metal... all the friction is gone... ...



My last thought is the front bearing on the transmission or the bearing between the front main shaft and rear main shaft in the transmission... . as you slow down your working these bearing from the other side so to speak... actually other side is very incorrect... ... but I think you understand what I'm after here... the power flow through the transmission is backwards... .





Hope this helps.....



When you decelerate you are applying power to the disc in the opposite direction as when you accelerate..... this means that the input shaft is trying to twist the disc backwards so to speak... if you have broken parts in the disc, and excessive wear in the disc you might hear it... .



Also as you foot comes off the clutch pedal during deceleration the clutch release bearing is slowing down... ... not speeding up... if it is full of dirt... . it can make noise during this time... .



I've also seen u-joints only make noise on deceleration and not acceleration... . and I've had one of my trucks that I would have bet money on the u-joints were fine... . I personally couldn't see any problems... and went past them... later backing up we took the drive shaft apart and I was fooled... . it did have bad u-joints... . so now if we take the drive shaft out... we pull part at one other joint beside the rear one for inspection... .

 

[Rattler]

My clutch made no noise, and was in really good shape when i pulled it out. All the grooves were still in the disk, it just would not hold when the box was turned up. Randy

 

[Mr. C]

I'd vote for the belt, but it's hard to guess just what the squeal sounds like.

 

[cArNiVaLwOrKeR]

I may have the same problem also, when i take off i hear the humm or noise, appears from the rear, or if i downshift on the offramp of a freeway i hear it @ times too. but not all the time. noise only last a split second or if i have the clutch kinda in the middle it could continue to make the noise.

better yet sounds like a older truck that makes a whining noise from a manual transmission.