Rep Power: 0

Hi everyone,
got myself a 2003 Honda Civic EM2 Coupe with D17A motor and 5-speed manual transmission.

Noise gets worse with higher speed and revs, more gas and maybe also with higher gears, although I didn't try driving in second at very high speeds. Going into neutral makes the noise disappear. There's no noise below 20 mph (or maybe very very slight noise) and in standstill.

Previous owner swapped clutch to a relatively new one with 12k miles which shifts like butter and (maybe?) also the transmission. Transmission fluid was changed only a few thousand miles ago. Both was done by a very experienced mechanic who worked on Honda vehicles for 50 years. Because of that it's kinda unlikely that it got the wrong transmission fluid.

Any ideas what it could be? It doesn't slip, shifts perfectly, doesn't smell burnt and doesn't happen in neutral so you can rule out a few things like throw out bearing.

 
Rep Power: 222

Trust no one. Check the fluid.
Bearings could be gone, or maybe something is wrong with the clutch

 
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Bearings were apparently changed as well.... I'm gonna change the transmission fluid and hope that fixes it. Getting a new transmission is kinda annoying in Europe. Are the transmissions interchangeable in 7th gen civics?

 
Rep Power: 222

Make sure to use the proper honda fluid.
d series in 7th gen are compatible with each other

 
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Yes, I got Honda MTF-3 luckily.

Even with different part numbers? I've found a lot of 7th gen transmissions but not with the same part number as mine.

 
Rep Power: 222

What's your engine code?
and just because the part numbers are different doesn't mean that they won't work.
I put a trans for a d17a2 in my car with a d17a1. Bolted right in. Worked great.

 
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It's the JDM D17A engine. No numbers behind the A.

 
Rep Power: 222

So ideally you want one for d17a, or d17a2. The gear ratios will be the same. A trans for a d17a1 will work but some of the ratios are taller so the car will feel a bit slower.

 
Rep Power: 0

Ok, I'll keep a lookout for them. Thank you very much!