Hi there. I've had my Supersport R for a year now - I built it last summer and completed the running in process in late spring this year. Ever since I've been able to use full revs, Ive found the gearbox crunches when changing from 1st to 2nd if the revs are over 4,500rpm. I assumed that the clutch needed adjusted or bled, so tried this a few times to no avail. I changed the gearbox oil too just in case (PitA). Eventually, with the 12 month warranty due to expire, I booked it in with Caterham (using Revolutions in Perth) to have them look at it. Unfortunately due to a series of unfortunate circumstances between the dealer and the factory, they ended up having the car for 2 1/2 months getting the gearbox out, sent down to Road and Race for repair, then back to Revolutions for fitting. Complete nightmare missing out on the whole summer (and 2 booked track days and a proposed road trip with mates), but I was just glad to get the car back. When I picked it up, I was advised to keep the revs low on the drive home to let the box bed in. I did a couple of hundred miles like this and all seemed fine, but when I first tried revving it above 4,500rpm again (with engine/fluids up to temp), crunch. Not good. I've dropped it back to Revolutions again to have the box removed and sent down south, but have asked for a proper gearbox swap now. I took a short (poor quality) video clip to demonstrate the issue. Holding the revs steady at about 4,500-4,750rpm in first, then changing slowly into second. It happens every single time. http://youtu.be/UBfqQsK0pdQ Has anyone else experienced this? Its the 5-speed Type-9 box. Brand new in July 2013. cheers Scott