Strange Nismo Noises

Originally Posted by sstroudwku

Actually it's the input shaft spinning the gears in neutral position. There is no spec for bearing end play on our 6MT. We actually had a long discussion about this down at Nissan MT Class. You're hearing the gear mesh, even though they're helical cut they still don't mesh tight enough to be quiet. Using a higher quality gear lube can help reduce the noise. However, the fact we keep no tolerance on end play it allows for a much louder gear box. You want to hear a really loud trans, look at the 03 350z first 4 weeks of production. Most were warrantied and replaced.