Afternoon All Ref: 1998 1700 xflow, 150 bhp, lightened flywheel, type 9 gearbox and De Dion A few days ago I tried posting on here only to discover that there's an issue with android on this forum. My missive went into great length about what had happened and asked for any thoughts on potential problems. However, things have moved on somewhat. The last blat of 2021 left me with a knocking noise that increased with road speed but wasn't apparent below 10mph. The car was put up on axle stands and started, put into gear and listened to....the loudest knocking seemed to be coming from the gearbox. That's me done for the season passed through my mind with me tucking the car up for winter and looking forwards to a spring engine and box out session in warmer times. Subsequent purchase of an engine crane (available to borrow if you're in the same boat and can fetch it), enabled swift extraction of engine and box with the offending item being taken to a renowned gear chap the next day. He gave it the once over and to my surprise stated that "there's nowt wrong with this, Lad". Now, I trust his judgement as he's a very clever chap who could have said the type 9 box is made of cheese but i can upgrade it for you at great cost...he didn't. He did, however, make various suggestions that included all of the drive train and associated mounts. I have experienced similar noises in other cars, mostly front wheel drive, that turned out to be cv joints. So, I have a few questions to throw out there:- Has anybody had a similar experience and if so what was the solution? Can a worn out driveshaft / cv cause an apparent noise at the gearbox? The nearside cv joint was significantly warmer - not hot - than the offside. Is this significant?I have bought new driveshafts from Caterham that seem to be a little longer than the ones I took off (is this normal?), new engine and gearbox mounts and once I've got the diff off for my gearbox chap to give the once over I will fit new uj's to the prop. Have I missed anything obvious as i don't want to put it all back together for it to knock again. Your opinions would be gratefully received. Cheers, Steve