Hi, I have a gearbox noise on my 225 box, i don't seem to hear when driving but when it's sitting, bring up the revs and it starts to make a noise, put my foot on the clutch, it slows slightly and then goes quiet? Only does it after it's been driven. Not from cold. Noise is hard to explain, maybe like a dry bearing at speed? It has a ttv r26r clutch and flywheel. Oil is elf nfp? I'm hoping it's not the mainshaft!
Give this a read, may help you? https://www.knowyourparts.com/techn...rain/diagnosing-clutch-bearing-bushing-noise/