Mini Cooper Speedo drive compatibility

Altering the final drive in a Mini Cooper can cause speedo inaccuracies. Whilst being a possible excuse for transgressing speed limits, it probably won’t keep you out of traffic cops notepads. This therefore needs attention.

Prior to 1980, matching FD changes to speedo readings was done by fitting a different speedo, an expensive way of dealing with the problem. After this the mix ‘n’ matching went on in the gearbox. More specifically the speedo drive spindle and pinion. So dealing with the easiest one first, fitment of any A+ gearbox with a 3.44 FD to a pre-A+ powered Mini, you need to fit the spindle and pinion out of the pre-A+ gearbox. Simple. If any other FD is fitted, it is easier and cheaper (in the long run) to get the speedo re-calibrated. Now the multiple choice option…check out the relevant table. This assumes 10” wheels and 12” wheels are retained where fitted as standard, but is reasonably accurate for 13” wheels, as the rolling circumference is very similar.

Speedo drive spindle and pinion data -