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Haight

Help! Loud ringing from driveshaft/transmission

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Ok guys, ea82, 5 spd manual d/r. I have searched the forum high and low and can't seem to find an answer. I have a loud ringing noise coming from the driveshaft/transmission when the rpms go above 2000. I am 100% positive that the noise is coming from the driveshaft right under the shifter. I just had it up on a hoist and used an acoustics tube to find the exact spot. We had already removed the heat shields so I know they aren't the culprit. The cat is good too. It sounds like somebody is going mad on a musical triangle when it is under load and when I hard rev it at idle. Oh and if I grab the drive shaft(without 4wd engaged of course) the sound goes away. It's like it is resonating or something. Any ideas?

Edited by Haight

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It's crazy how the world works; or our cars are on a specific schedule to do things at certain times. My 5 speed d/r just started doing the EXACT same thing. Just like how you describe. I haven't investigated it further. What I can say is that I recently put a new axle in the rear after going a year missing one. For this reason I thought it was maybe the spider gears in the rear diff being worn from so many miles with only one axle on the back wheels, but that's just speculation. I have no idea what it is. My car is in rough shape right now.

Does yours continue to emit the noise even after placing it in neutral and rolling?

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No it doesn't do it in neutral.

No idea on the u joints.

And no, the exhaust has nothing to do with it.just completely redid the whole exhaust today. Problem is still there.

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Check for sloppiness in the u-joints, especially if you are still running your original driveline. The bearings on the factory installed drive shaft are staked in, if 

the u-joints have ever been replaced odds are there will be cir-clips visible that lock the bearing caps in.

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Mine was making a similar (riiiiing piting piting) noise ended up being the exhaust hanger before the rear wheels, just my experience.

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How do I check? (The driveshaft)

grab near a joint, one hand on the shaft each side of where the u-joints are, and try moving the joint around. If you get side to side play bearings are probably shot, but keep in mind a small amount of up-down (in relation to the direction the needle bearing sit in the caps) is normal.

 

Also, check the support bearing at the middle of the drive shaft. If it's bad or the rubber surround is rotted, it could cause some noises.

 

This article is pretty straight forward on drive shaft checks:

http://www.howacarworks.com/transmission/how-to-check-u-joints

Edited by SmashedGlass
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cue Twilight Zone theme music ...

 

Only just twigged the other day what the ring ting, ting noise is in my EA82 5MT. It is different to really dry and embedded roller needles in an EA81 one piece tail shaft, but that is what its gotta be in mine. had it for ages and thought it was something in the box itself - shifter rails tinkling against each other - then it dawned on me - the short front half of the two piece would have a different tone due to its shortness.

 

Thought it could be a little end bush but noise is there at road speed and does not correspond to engine revs.

 

Not a job I wanna do - staked uni's :(

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I took mine to a drive shaft shop, with new joints that I purchased. They charged me something like $40 to press out the staked in factory joints, install the new with the circlips, lube, and even balanced it. Well worth it if you don't have access to a press.

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dry looking rusty red browny apearance about the unijoints ? I have found EA81 unijoints not actually have any play - so no vibration, no shake in the rear view mirror but the needle rollers in the uni joints were so dry that they wore themselve ridges into the inner 'pin' of the uni joint.

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Are you sure that under load the drives haft isn't hitting the exhaust at all? The drive shafts and exhaust move around a bit and can flex so just because it isn't touching just sitting there it could be when you drive it.

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I'm positive. I had the car on a hoist and was under it when a friend revved the car. The exhaust doesn't touch. I'm positive that the sound is coming from inside the driveshaft. When I grab it with both hands the sound goes away. It is like the sound is resonating throughout the metal.

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Does the sound go away with clutch engagement/disengagement? I had a T5 do the same thing when the rear mainshaft bearing was failing. Would go away when the mainshaft stopped spinning (clutch disengaged/pedal in).

 

Also check for trans-mount play. It could just be resonating the engine/drivetrain vibrations at certain RPMs due to tired mounts.. or there could actually be something inside the driveshaft!

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I'm positive. I had the car on a hoist and was under it when a friend revved the car. The exhaust doesn't touch. I'm positive that the sound is coming from inside the driveshaft. When I grab it with both hands the sound goes away. It is like the sound is resonating throughout the metal.

That's not enough to tell as the car isn't under load.

The suspension moves & the engine will twist more when it loaded up.

Is the hoist the type that picks up under the body, or you've driven on it & it lifts by the tyres?

 

Get the car back on the hoist, grab various parts of the exhaust (while cold & with the engine off), and shake it as violently as you can, it shouldn't hit anything.

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The car drives onto the hoist. Once again, the exhaust has nothing to do with it. Positive. I just rebuilt the whole exhaust system from the headers-back. Yes the sound does go away with clutch engagement or when I let off of the gas. I will check the trans mounts.

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Sounds like the pilot bearing is shot.

Same symptoms that my brother was having on his Chevy ZR2.   No mechanic in Seattle area could diagnose the problem correctly.  They all said the transmission was going out.

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Update. The sound goes away when I engage 4wd.

Mine did the same... That's how I figured it was the exhaust, enaginging 4wd balances the torque flex of the drive train

 

All of your mounts good? Motor mounts, trans mount, that dog bone anti-pitch thing...

Edited by TallonX
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I was gonna say, diagnosing a subaru shot uni is different from most other makes due to the PT FWD where the tail shaft to drive rear wheels is just along for the ride most of the time so is not transfering power, so no load to cause vibes etc, and things may change by engaging rears into play.

 

Oh, and in my EA82 Y pipe it has that double walled piping/tubing...something has deteriorated internally and makes a bloody awful rackt on acceleration sometimes, other times quiet as. Embarassing but free $ :)

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