Hello,
I have just had my 1969 mkIII Riley Elf fully restored and Coopered. We put the original gearbox back in only to discover it doesn’t like 4th gear. It keeps popping out, especially when you speed up too quickly. Can anyone enlighten me on the problem. The other gears are great. Can you advise whether I should buy a new gearbox or just get the 4th gear replaced or repaired. Also how much does a job like this cost? Many thanks Al.