4l80e - input / output shaft noise when spun by hand
05-01-2014, 09:47 AM
#1
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4l80e - input / output shaft noise when spun by hand Hey guys, quick question
Picked up a supposedly good 4l80e. Trans looks clean, i pulled the pan and it is very clean. Trans was full of fluid still, it was not burnt, smelled clean, no metal or clutch material in pan, magnet was clean etc. But....
When i spin the input or output shaft by hand, i can hear a constant "growling" noise, similar to gears meshing loudly. I know these trans are noisy compared to 4l60 / Th350 / 700r4 etc but im wondering if anyone else can confirm this is normal? I also did check the parking pawl, and it is not dragging. The noise is consistent, does not sound like a clunk or a broken tooth somewhere. Opinions? Dont want to tear it down for nothing, if this is in fact a normal noise Ill take my chances and see how it does in the vehicle. You can check the noise on my youtube link here...
Thanks!
Picked up a supposedly good 4l80e. Trans looks clean, i pulled the pan and it is very clean. Trans was full of fluid still, it was not burnt, smelled clean, no metal or clutch material in pan, magnet was clean etc. But....
When i spin the input or output shaft by hand, i can hear a constant "growling" noise, similar to gears meshing loudly. I know these trans are noisy compared to 4l60 / Th350 / 700r4 etc but im wondering if anyone else can confirm this is normal? I also did check the parking pawl, and it is not dragging. The noise is consistent, does not sound like a clunk or a broken tooth somewhere. Opinions? Dont want to tear it down for nothing, if this is in fact a normal noise Ill take my chances and see how it does in the vehicle. You can check the noise on my youtube link here...
Thanks!
Last edited by LQ9CHEVELLE; 05-01-2014 at 10:19 AM.
05-01-2014, 10:22 AM
#2
I'm not saying that the sound is normal or that there is definitely something wrong, as I don't have a ton of experience with these transmissions. BUT I will say that the sound is probably much louder now, due to the fact that there is no more fluid in case. I know that if you do the same thing with a rear end the gears will make more noise without fluid in the case....Just my two cents...take it for what it's worth
05-01-2014, 10:39 AM
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I'm not saying that the sound is normal or that there is definitely something wrong, as I don't have a ton of experience with these transmissions. BUT I will say that the sound is probably much louder now, due to the fact that there is no more fluid in case. I know that if you do the same thing with a rear end the gears will make more noise without fluid in the case....Just my two cents...take it for what it's worth
05-01-2014, 11:05 AM
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It does sound like gears meshing (loud, large gears!) You would think if It had damage to the planetary gears that there would be some kind of metal in the pan? Pan was super clean. Pan gasket was older and the outside of the pan/trans did not appear as if the seller pulled a "fast one" and wiped the pan out or anything. Just trying to avoid ripping this thing apart if I dont have to. Decisions decisions.....
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05-01-2014, 11:40 PM
#8
Alright finally got it to load. The little screeching noise sound is totally normal, but the heavy clanking sound is not at all, never heard that before actually. I noticed you seemed to be spinning to input shaft by hand rather easily, which shouldn't be the case. It's a heavy assembly to spin by hand and shouldn't be very easy to spin like that bare handed.
The noise shouldn't be coming from down low, there's no way you could rotate the assembly to that point, so get your mind off of potential parking pawl problems and what not. Pull pump and the input assembly and inspect from there. I know it sounds like a paint in the ***, but pulling the assembly is a very quick and easy deal. Inspect your input shaft and OD planetary. Something could be broken, but I'll be honest and say I'm not 100% sure, like I said I've never heard that sound before. However, with or without fluid in the transmission doesn't matter, the clutches would still be soaked. In fact, the clutches being soaked should make it even harder to turn the assembly because the overrun clutch housing is splined to the OD clutches which should be nice and soaked and compact.
Yank it out man, you shouldn't need to remove the valve body to remove the OD basket bolt to go further into it, I'm betting if there is an issue, you'll find it right there in the front.
The noise shouldn't be coming from down low, there's no way you could rotate the assembly to that point, so get your mind off of potential parking pawl problems and what not. Pull pump and the input assembly and inspect from there. I know it sounds like a paint in the ***, but pulling the assembly is a very quick and easy deal. Inspect your input shaft and OD planetary. Something could be broken, but I'll be honest and say I'm not 100% sure, like I said I've never heard that sound before. However, with or without fluid in the transmission doesn't matter, the clutches would still be soaked. In fact, the clutches being soaked should make it even harder to turn the assembly because the overrun clutch housing is splined to the OD clutches which should be nice and soaked and compact.
Yank it out man, you shouldn't need to remove the valve body to remove the OD basket bolt to go further into it, I'm betting if there is an issue, you'll find it right there in the front.
05-02-2014, 09:13 AM
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Alright finally got it to load. The little screeching noise sound is totally normal, but the heavy clanking sound is not at all, never heard that before actually. I noticed you seemed to be spinning to input shaft by hand rather easily, which shouldn't be the case. It's a heavy assembly to spin by hand and shouldn't be very easy to spin like that bare handed.
The noise shouldn't be coming from down low, there's no way you could rotate the assembly to that point, so get your mind off of potential parking pawl problems and what not. Pull pump and the input assembly and inspect from there. I know it sounds like a paint in the ***, but pulling the assembly is a very quick and easy deal. Inspect your input shaft and OD planetary. Something could be broken, but I'll be honest and say I'm not 100% sure, like I said I've never heard that sound before. However, with or without fluid in the transmission doesn't matter, the clutches would still be soaked. In fact, the clutches being soaked should make it even harder to turn the assembly because the overrun clutch housing is splined to the OD clutches which should be nice and soaked and compact.
Yank it out man, you shouldn't need to remove the valve body to remove the OD basket bolt to go further into it, I'm betting if there is an issue, you'll find it right there in the front.
The noise shouldn't be coming from down low, there's no way you could rotate the assembly to that point, so get your mind off of potential parking pawl problems and what not. Pull pump and the input assembly and inspect from there. I know it sounds like a paint in the ***, but pulling the assembly is a very quick and easy deal. Inspect your input shaft and OD planetary. Something could be broken, but I'll be honest and say I'm not 100% sure, like I said I've never heard that sound before. However, with or without fluid in the transmission doesn't matter, the clutches would still be soaked. In fact, the clutches being soaked should make it even harder to turn the assembly because the overrun clutch housing is splined to the OD clutches which should be nice and soaked and compact.
Yank it out man, you shouldn't need to remove the valve body to remove the OD basket bolt to go further into it, I'm betting if there is an issue, you'll find it right there in the front.
05-08-2014, 03:29 PM
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Wanted to follow up on this and let you all know what I found....
I hate it when people dont post the outcome, after asking for advice!
SO.......took pump out, had a broken input shaft, broken roller clutch, broken drum, broken sprag.....the carnage was unbelievable! Somebody had to have cleaned that pan out, and filled with clean fluid before they sold me that trans. No way it could have muched those parts and looked as pristine as it did in the pan / valvebody area, with no metal to be found. Oh well, win some and lose some....
Thanks again for the help, and the advice!
I hate it when people dont post the outcome, after asking for advice!
SO.......took pump out, had a broken input shaft, broken roller clutch, broken drum, broken sprag.....the carnage was unbelievable! Somebody had to have cleaned that pan out, and filled with clean fluid before they sold me that trans. No way it could have muched those parts and looked as pristine as it did in the pan / valvebody area, with no metal to be found. Oh well, win some and lose some....
Thanks again for the help, and the advice!
