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Rattling Noise At Speed, No Throttle, Downhill (Swapped Engine/Tranny)

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Old 06-24-2018, 02:47 PM
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Rattling Noise At Speed, No Throttle, Downhill (Swapped Engine/Tranny)

Hey guys,
Finally have some time to work on the project. Running decently.

I am stuck figuring out what is going on. Engine/Tranny (4.3L/700r4) seem find until I am at speed and off the throttle. I am getting a bunch of rattling noise from the front of the truck. Very repeatable when I am at speed, no throttle, and going downhill. If I start to accelerate, the noise goes away until I am off the throttle again.

I have checked all fluid levels and can't find anything loose.

Any suggestions?
Old 06-24-2018, 03:24 PM
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Check your catalytic converter
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