cursed bat

Just recently after the "Biggie" service the gearbox on my 29k mile P1 has developed a crunch going from 3rd to 4th at reasonably high revs......

Gearbox /clutch never abused so quite puzzled, surely not a worn synchro on this mileage? Doesn't happen all the time (like all concerning noises lol!)

Any advice/tips greatly appreciated.

Thanks!

scoobyboy

i have just replaced 3rd and 4th synchros on a p1 for graunching but check what oil they used first and it's level, syntrax seems to be the recommended oil on here