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mojav
Samba Member
Joined: December 04, 2022
Posts: 12
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 Posted: Mon Jul 07, 2025 6:04 pm Post subject: Humming sound from rear axle |
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2WD ‘89 Vanagon with 2.5 Subaru straight drive
Longer day on the highway today and discovered a humming sound coming from the back. The sound occurs while decelerating and idling. So when in neutral and coasting there is a humming which seems to have a cadence with the wheels/tires. When I go into gear and accelerate it stops. Any ideas?
My tires are quite bald and I was planning on getting new tires this week but seems unlikely that is the issue because it’s only happening in neutral. Thanks
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mojavmusic.com |
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fxr
Samba Member
Joined: December 07, 2014
Posts: 2635
Location: Bay area CA
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| Posted: Mon Jul 07, 2025 6:17 pm Post subject: Re: Humming sound from rear axle |
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When do you ever go into neutral long enough to hear a humming sound?
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Jim Crowther
1984 1.9l EJ22 Westy Wolfsburg Edition
Vespa GTS 300 |
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4Gears4Tires
Samba Member
Joined: October 08, 2018
Posts: 4099
Location: MD
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| Posted: Tue Jul 08, 2025 10:34 am Post subject: Re: Humming sound from rear axle |
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Could still be the tires. Adding or removing load will change the harmonics of rotating objects because of a long list of reasons.
Change the tires because you need to do that anyway.
Change the oil in the trans because you need to do that anyway.
How old is your clutch, pilot bearing, and throw out bearing?
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'87 Syncro Ferric Oxyhydroxide Superleggera Edition
'85 Westy Sciuridae Domus Edition |
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 18675
Location: Retired South Florida
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| Posted: Tue Jul 08, 2025 10:37 am Post subject: Re: Humming sound from rear axle |
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| Subaru straight drive. Does that mean Subaru engine, clutch and transaxle? |
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