Help! S111 gear box

Sounds like a detent spring on the synchro mesh unit for 3rd 4th gear have snapped jamming it.

This is a common problem. There are 3 of these springs Part No. RTC1956 cost around 50p each.

The problem is replacing these can be awkward. The proper way is to remove the gear box and strip out the Primary pinion and synchro unit. I have heard of people managing the replace them with the box in situ but I haven't tried it myself. I think there is a website describing how to do this somewhere.

Regards

Liam

Thanks.

Try