So at first I thought this might be a loose flywheel, but after further inspection the noise is coming from the transmission pan. Do y'all think it could be a bad pump or no? I don't know much on transmissions so any help on what to expect or things I could check would be appreciated
Could this be a bad transmission pump?
- Thread starter triker97
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Hopefully @NickTransmissions can chime in with help.
In the future, it is always best to post what year, make and model vehicle you have. Or is it a secret?
In the future, it is always best to post what year, make and model vehicle you have. Or is it a secret?
strutaeng
Full Access Member
Very strange noise. Does the transmission work okay? Did that noise just start? Have you owned the truck for awhile?
I don't think that's a transmission pump, those using will whine if they are starved for oil. But could still be something internal to the transmission.
At some point I think I heard something that could be catalytic converters rattling (?)
I don't think that's a transmission pump, those using will whine if they are starved for oil. But could still be something internal to the transmission.
At some point I think I heard something that could be catalytic converters rattling (?)
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The video sound...... A rattling heat shield somewhere? The noise seems like a thin metal? ( A flywheel noise would sound 'heavier'? )....
Previous questions to be answered, would be helpful....
Previous questions to be answered, would be helpful....
I did not listen till now. IMO, does not sound like heat shield but does sound like metal skipping. You said noise is from transmission. Should record under truck and have another person rev the truck. Could easily be in the torque converter area/flexplate area. Like @strutaeng asked, does it drive ok and does it make the noise when accel while driving or just sitting still?
Along with the suggestions above, maybe a starter that isn't retracting all the way.
Sorry it's a 06 Yukon XL 1500 RWD with a 5.3 and a 4l60e
The transmission works ok, it has been making this noise when I let off the gas for a few months, I've had the truck for maybe 6 months now. She has 230k on the dash, I checked everything that could rattle and nothing, I definitely heard it from the transmission, it sounded like it was right behind the pan
I don't hear anything when I am driving, I heard it once when I was in reverse, but other than that I only hear it when I'm sitting still after I rev it to 2k and let off gas
You need a stethoscope to pinpoint exact location.
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You need to raise it on a lift.....
SOMETIMES, by taking it to a legit transmission shop, and ask an "old school" tech to listen, maybe the sound is familiar to the mechanic and can steer you in the right direction.
SOMETIMES, by taking it to a legit transmission shop, and ask an "old school" tech to listen, maybe the sound is familiar to the mechanic and can steer you in the right direction.
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I don't know the difference of the transmissions, but, in my 1988 GMC C2500, the forward pump failed. It made a 'similar' but MORE OF A SOLID sound, for 10 minutes, then immediately, the 700R4 went into a neutral ( no more go )..... ( The forward pump is located behind the 8" cover, where the torque converter attaches.)
rockola1971
Full Access Member
Sounds like a torque converter bolt backed out and its head is striking something or possibly a rock jumping around in the area of the torque converter. Is the plug still in place?
I would want to look up in the flex plate mount bolts area, for cracks in the flex plate. Should be ruled out as a source of the noise.
Or, where the torque converter engages at the front pump area.
Or, where the torque converter engages at the front pump area.
rockola1971
Full Access Member
Yup a cracked flexplate will mimic the noise in the vid too. The noise comes from the flexplate distorting outward around the crack and the nearest torque converter bolt head strikes the bellhousing area.
It's a good thing I bought one a while ago, are there any certain points to listen were it would tell me what it could be? Like for example listening to point A it could be the pump
Listening to point B it could be a a worn gear
Point C could be whatever else
My stethoscope had a pointed metal probe that allows for tight places and also a hollow tube with a coned cup to seal the listening area:
Another way would be to remove the inspection cover and look in there for the loose bolts or cracks. A bore scope is great to have. I wish I had one.
Another way would be to remove the inspection cover and look in there for the loose bolts or cracks. A bore scope is great to have. I wish I had one.
So I've been doing some research but what do you think the chances are that the noise could be a worn parking pawl?? My truck does roll a little after putting it in park and there have been times where it's hard to get out of park. @NickTransmissions I don't know if you've seen the video, any help or advice would be greatly appreciated
I have the same stethoscope and I'll try to pinpoint the noise more this weekend, hopefully I'll be able to get a video up for yall
