Thanks for the information.
According to the manual the speedo reading is controlled by various combinations of the shaft in the box and the gear on the end of the speedo cable. Mine should be 6 on the box and 20 on the cable. Alas it only has 17 teeth on the cable which is for the 1600 model. I haven't had the torque converter out to check whether that was changed with the box. Looking at the manual it does show that the 1600 converter has ratio of 2,02:1 whereas the 2000 shows 2,35:1. Would this affect the speedo reading?
Regards and thanks again,
Dave