Need help identifying weird noise above 50 mph

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HuskerFan

Junior Member
Joined
Mar 28, 2017
Posts
21
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Location
Lincoln, Nebraska
First Name
Chad
Truck Year
1976
Truck Model
K20
Engine Size
454 Big Block
Hey guys, wanted to post to ask for help with identifying the weird noise i'm having and understand a bit more what speed i shouldn't go above with the setup i have on my truck. It's got the turbo 350 tranny, 203 t-case, 14 bolt rear with 4.88 gears. Long story short, guy that did some work on the truckl passed away a few years ago, so i'm identifying the work he did. I attached a link for the video of the weird noise i get when i get above 50 mph. I can hit the gas and the truck will go faster, but the noise is still there. Seems like i shouldn't be going above 50 or something, but i'm trying to understand why and/or what the limiting factor is that's making this noise/keeping me from going above 50 without the noise. Any input you guys have is greatly appreciated! thanks guys!

Weird Noise: https://www.youtube.com/watch?v=_a_2yhAhKZo
 

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