Hi guys trying to diagnose a whirring noise in my 180sx when I reverse. It sounds like when a planes wheels come down lol and it only happens when the cars cold. I’m planning on pulling the box and doing front and rear oil seals cause they both leak. I was thinking it’s because the gearbox oil is getting on the clutch? Also dose any one have links for a work shop manual in English to do the gearbox seals? thanks