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i have an 04 250 6.0 its makeing an loud screehing noise when i take off or when i get on it really hard has anyone ever had this problem please help
 

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It could be a loose belt from a weak tensioner or any of the pulleys.
A worn or glazed belt can squeal also.
 

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Could also be a leak in the up pipe or y pipe at the flex or bellows. They will squeal when they leak.

Something like this:

 

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my truck squealed real loud when i took off or made boost because the stupid plastic intecooler pipe cracked
 
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