Hey guys just havnt got a chance to ask about it...but i have been hearing crunching when changing into 4th gear when on boost from 3rd and sometimes when dropping down from 6th gear going around 110 and dropping to 4th makes a crunch.

Would would the sound of that be? hope its not major.
Possible ideas i gather would be gearbox oils?

car is an 05 sti

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