Run half tranny fluid, half gearbox oil for 1000kms
then drain and replace with gear box oil. I burred a tooth on my 4th gear in my Sti and this stopped the crunching until I totally f--ked it.
I dont profess to being a mechanic and cannot tell you the exact differences
I do know that the auto transmision fluid they sell at kmart is not the same stuff as the redline gear oil I was using in my gearbox at the time. They are totally different consistencies.
I do know that this worked for my car at the time and it was worth a try before pulling the box out and pulliing it apart.
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