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Mod | | | Forums66 Topics128,022 Posts1,055,353 Members48,420 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2009 Posts: 101 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2009 Posts: 101 | I am running a 235 with original HydraMatic and torque tube. When I am accellerating I hear something that sounds similar to a rod knocking. When I decelerate it stops. Don't think it's a rod. Wondering if it could be the universal joint?
Disciple
| | | | | Joined: Mar 2008 Posts: 3,750 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 3,750 | Noises are obviously hard to diagnose on the internet,unless you post a video with sound.
I assume the noise is emanating from somewhere other than the engine bay?
A worn out UJ can cause knocking/clunking,are you aware of any vibration related to the noise?
1950 Chevy Advance Design 3100 in ScotlandIn the Stovebolt GalleryMore pix on Flickr. I've definately got this truck thing in my blood ... my DNA sequence has torque settings"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.
| | | | | Joined: Jan 2009 Posts: 101 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2009 Posts: 101 | I understand without positng a video with sound how it could be hard to diagnose. It only happens while I am accelerating while in gear, and just before the HM shifts. In the 3-4 gear it starts at about 50 mph. Definitely coming from the engine bay or transmission area. Not real loud just bothersome.
Disciple
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