if your cables are free and not broken then have a look at the 10mm pinch bolt at top of selectorr on g/box,the sometimes work loose,if that is ok then the top cover can come off the g/box/a ring of 10mm bolts and reverse sw.connector & breather tube,when off have a look at the top needle roller bearing just under the oil seal on the selector shaft,these are bad for seizing,you can`t get these bearings now and you have to buy the complete assy which is very expensive,but try penetrating fluid and gently try and get the shaft moving and free,apply plenty of grease and oil and hopefully it will be ok.just some things to check,good luck
cdc, August 2012
