Shouldn't need any break-in as such.
They shouldn't make any noise. You sure you have the primary and secondary shoes in the proper place? Or a piece of hardware or spring maybe not seated properly.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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