Noise from transmission

[nibbes123]

How would you determine if the clutch release bearing is gone? The noise I hear starts at 2500 rpm and settles at 4000 rpm. Shifting transmission in all gears is great .
Nick

[dmwhiteoak]

That doesn't sound like a throw out bearing to me. When mine was going out the only time you heard it was at an idle with the clutch disengaged. The last time I drove it before I fixed it , it sounded like two chipmunks having a go at it in the bell housing. I replaced transmission and all so not sure if that was the source. What kind of sound is it making?

[burlybryan]

Yeah, a bad release (throw out) bearing sounds like a UPS truck pulling away. The initial engagement of the tranny produces a squeal. Goes away once loaded after clutch is let fully out.

Is the noise under the shifter or more forward? Every bad pinion I've had made a groan when under load (kind of like my current third gear!) but wasn't specifically rpm aligned.

If it's been a while, drain the gear oil and look for metal or a drain plug magnet with lots of spikey metal fragments.

[nibbes123]

Yes under the shifter and around the tunnel. I know it is not the drive shaft replaced the u joints, carrier bearing , the rubber flex coupling.

[fiat218]

How would you determine if the clutch release bearing is gone? The noise I hear starts at 2500 rpm and settles at 4000 rpm. Shifting transmission in all gears is great .
Nick

or squeals

[RRoller123]

I also have an intermittent chirping sound, not very loud, that sounds like high frequency crickets, comes and goes above 30mph. Haven't been able to isolate it. Hoping it is not transmission. Drive shaft has been rebuilt, no change.

[nibbes123]

Found where noise was coming from, it is in the rear axle mite be the bearings on the axle.
Nick

[Fi8spider]

I also have an intermittent chirping sound, not very loud, that sounds like high frequency crickets, comes and goes above 30mph. Haven't been able to isolate it. Hoping it is not transmission. Drive shaft has been rebuilt, no change.

Recently the same happened to me immediately after rebuilding the drive shaft. I replaced the front coupling, the two uni joints, the centre bearing and pillow block. The car test drove ok and I thought that was that but the next day while driving the car an itermittent chirping sound occured and I could not get it to repeat under similar load or speed, the sound had a mind of it's own fading in and out whenever it wanted.

Upon reinspection I noticed that the centre pillow block did not centrally locate when being reattached to it's mounting point on the tunnel. On closer inspection of the pillow block I noticed that the two holes in it for the bolts to go through were too big for the bolt shaft, this obviously opens up the possibility of the pillow block sitting off centre or askew when tightened up. It took me a couple goes at unnipping the pillow block bolts and tapping left or right then retightening them and test driving before I got the noise to go away.

Ideally a small sleeve in the enlargened holes in the pillow block to the correct bolt shaft size would be the right thing to do or am I missing some locator part here that I'm unaware of.

[azruss]

those holes are oversized for a purpose. a large grommet with a sleeve goes there as a vibration dampener. it is also very easy to get the bracket on backward (ask me how i know this).

[fiat218]

those holes are oversized for a purpose. a large grommet with a sleeve goes there as a vibration dampener. it is also very easy to get the bracket on backward (ask me how i know this).

why asked u when u know u screwed it up lol

[RRoller123]

Thanks for the input, I will check that out! I also had the drive shaft rebuilt and the chirping went away, but came back after only about 30 miles, so this may be it! I will check for the presence of the grommets too. I had been suspecting wheel bearings, but they don't get hot, so this is probably it. I love this site.

[azruss]

a chirp can come from a small bearing that is going bad. the pilot bearing is a possibility

[RRoller123]

Where is the pilot bearing located? We are having a heck of a time isolating where this noise is coming from. It is like high-frequency crickets or that real high frequency grasshopper noise that you sometimes hear while driving by. We thought for a day or so that that was what it was. Unfortunatey not... It is not coming from my (driver's ) side, and the best the passengers can come up with is that it seems to come from somewhere forward.

Did I hijack ths post? My apologies if so, I will start a new one if asked.

[azruss]

the pilot bearing is a small needle bearing located in the back of the block that the tranny input shaft fits in. that bearing turns with the input shaft. if the seal is bad and it is dry, then you can get a high whine or chirp. the sound would travel to the tranny.

[RRoller123]

If it fails I assume catastrophe? I have been driving with it chirping for awhile, (if this is the source).