05 Metal box with 3 air or fuel lines over rear end?

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exxxtrem

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Im lowering my tahoe and the rear end is going to hit a 10x10x4 inch black box with 3 air... or fuel lines attatched to it.. i think air lines. What is it? I unhooked the 3 lines and it seems to run the same. havent driven down street just started moved forward and back 10 feet... is it necessary?
 

clkelley

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Good morning,

Take a picture of what you are talking about so we can narrow it down. Not sure what metal box you are talking about.
 

exxxtrem

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set
 
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