Standard classic Minis with 4-synchro gearboxes usually have a wide-ratio gear set for normal street driving conditions. However, some Mini enthusiasts prefer the closer ratios as fitted to the Cooper S and 1275GT Clubman mode. The wide ratio gearset can be converted to the close ratio set by changing the first motion shaft and the layshaft. This kit includes both the correct 22G1040 laygear and the 22G1371 18-tooth 4th gear/first motion shaft, which fit the small original 14mm mainshaft. For pre-A+ gears only. Ref: C-AJJ4032, 22G1371, 22G1040.