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Old 07-24-2019, 09:26 PM   #1
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Default Whatís this noise on my TA?

Output shaft bearing? U-joint? This was in the air, in neutral, turning one wheel forward. However, on the ground I only hear it when itís reversing, and when cold. Noise goes away when itís hot and in drive.

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Old 07-24-2019, 09:30 PM   #2
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The way the sound isn't consistent with the speed of it turning but very consistent with the U-Joint makes me think that's what it is, but I am no Fbody whiz.
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Old 07-24-2019, 09:45 PM   #3
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Well, I take back the conditions of reverse. That seems to be a different noise coming from the rear when under load and both rear tires spinning backward. Itís more of a deeper slow door creaking growl.

Cool.
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Old 07-24-2019, 10:00 PM   #4
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Metal on metal rub, for sure. Can you add a few drops of oil to likely outside areas to see if there's any change?
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Old 07-24-2019, 10:31 PM   #5
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Saving this here. Will watch vid tomorrow.

https://ls1tech.com/forums/automatic...shing-bad.html
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Old 07-24-2019, 10:38 PM   #6
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They mention taking the tail shaft off and spinning the output shaft to see if the noise is still there.
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Old 07-24-2019, 10:41 PM   #7
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Sounds like a t56 swap
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Old 07-25-2019, 06:24 AM   #8
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Then thereís this thread where someone says they all make a noise. Perhaps because the rear end was up and the fluid was off of the rear bushing?


https://ls1tech.com/forums/automatic...squealing.html
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Old 07-25-2019, 07:12 AM   #9
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Noises like that are never normal. And they all do not make noise. My car never made any noises like that prior to itís th400 swap. I would go with the first link you mentioned.

How are the driveline angles as well? Is the car lowered or anything?
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Old 07-25-2019, 07:45 AM   #10
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Lowered, adjustable torque arm, pinion angle set to -2 degrees I believe.
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Old 07-25-2019, 07:51 AM   #11
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Yea I would look into the tailshaft area as mentioned on ls1 tech.
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Old 07-25-2019, 07:57 AM   #12
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there is no bearing back there in the 60e though.
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Old 07-25-2019, 08:01 AM   #13
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They mentioned it may be a tail shaft bushing. Replace that along with the tail shaft.
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Old 07-25-2019, 08:02 AM   #14
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Quote:
Originally Posted by daturbosix View Post
there is no bearing back there in the 60e though.


Thereís a bushing though right?
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Old 07-25-2019, 08:13 AM   #15
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yes. a case bushing as well as a tail shaft bushing.
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Old 07-25-2019, 10:59 AM   #16
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A U-joint wouldn't necessarily squeal like that. It's bore more of a squeaking as the shaft rotates and obviously pick up in cadence as rpm's increased. You also might (most likely), get a vibration at moderate speeds. I just went through this on the Suburban.
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Old 07-25-2019, 11:19 AM   #17
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@Bru hows the diff fluid look?
is it possible that the carrier bearings just shit the bed and that noise is resonating through the driveshaft to the tail?

i talked with Carl here at redline powertrain and he said he has never seen a case or tail bushing cause a noise like that
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Old 07-25-2019, 11:44 AM   #18
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Quote:
Originally Posted by daturbosix View Post
@Bru hows the diff fluid look?
is it possible that the carrier bearings just shit the bed and that noise is resonating through the driveshaft to the tail?

i talked with Carl here at redline powertrain and he said he has never seen a case or tail bushing cause a noise like that


I changed it before TCG Tour 2016 using GM LSD additive, so like 5,000 miles ago.

Hmm, carrier bearing. Could be a possibility. I swear the noise is coming from the tail shaft area, but acoustics are weird under there, especially when itís up in the air on the ground.

Marty installed the gears at your shop back in 2011, and you ordered the gears and master install kit for me. Itís only been about 12-15,000 miles, so maybe not the carrier unless something else has worn it out.
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Old 07-25-2019, 11:47 AM   #19
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its a possibility 10 bolts make noise. my 3.42 axle i had in my formula was a noisy son of a bitch. but it never broke... soo something to keep in mind.
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Old 07-25-2019, 12:08 PM   #20
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Unbolt the shaft from the rear end and spin it. If the noise is still there that rules out the differential.

If itís gone, take the cover off the diff and check the wear.
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Old 07-25-2019, 12:09 PM   #21
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the problem with the 10bolts is the cases have so much flex to them. the pinion will literally try to walk away from the ring gear
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Old 07-25-2019, 12:26 PM   #22
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Agreed. Could be setup right one moment and a few good launches in its out of wack.
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Old 07-25-2019, 12:43 PM   #23
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Quote:
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Agreed. Could be setup right one moment and a few good launches in its out of wack.
no idea how some guys have gone bottom 10s with a STOCK lsd 10 bolt while sprayin the world at them right out of the gate lmao..
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Old 07-25-2019, 12:44 PM   #24
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the 1st LS1tech thread did not have many posts, the OP never followed up.
The sound that Bru's car is making, to me, is exactly like the video in the thread.

good luck figuring it out Bru !
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Old 07-25-2019, 01:12 PM   #25
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Quote:
Originally Posted by daturbosix View Post
no idea how some guys have gone bottom 10s with a STOCK lsd 10 bolt while sprayin the world at them right out of the gate lmao..


Eh sometimes stock is best stock is fastest lol. My 10 bolt is sitting in my garage. Zero issues with it no noises. Iíve gone 11s cutting 1.4 60 fts on it.
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