The world famous 5 speed close ratio gearbox design project was engineered for Mini Spares by David Hirons. Using over 58 extra parts plus extensive machining the 5th gear is technically an overdrive gear 0.882-1 which equates to 3.037 when using 3.44 crown wheel and pinion.

The closer ratio is suitable for 1275-1380cc except Turbo boosted minis, the strength of the standard helical cut A plus gears is dependent on the torque capability of the original 2nd/3rd gears plus the final drive pinion and new 5th gear,(I.e about 80-85ft lbs of torque). These 5 speeds have successfully been used with an 8 port head and 286 camshaft in Keith Dodd’s car and also in his Yellow Sprint which has a straight cut 5 speed under a fuel injected 1460cc power unit built By MBE Race engines with 143bhp=115 at wheels.

See our range of 5 Speed Gearboxes below:

1. MSG04 - GEARBOX 5 SPEED A PLUS GEARS,except TURBO ( + SURCHARGE £250)
2. MSG04-32 - GEARBOX 5 SPEED A PLUS GEARS WITH 3.2 FINAL DRIVE
3. MSG05 - GEARBOX 5 SPEED HELICAL WITH X PIN DIFF ( + SURCHARGE £250)
4. MSG05-31 - GEARBOX 5 SPEED HELICAL WITH X PIN DIFF ( + SURCHARGE £250)
5. MSG05-32 - GEARBOX 5 SPEED HELICAL WITH X PIN DIFF ( + SURCHARGE £250)
6. MSG06 - GEARBOX 5 SPEED EVOLUTION STRAIGHT CUT SET
7. MSG07 - GEARBOX 5 SPEED EVOLUTION STRAIGHT CUT GEARS + X PIN DIFF
8. MSG10 - GEARBOX 5 SPEED S/CUT CLUBMAN WITH LSD AND CROWNWHEEL

Importation rules regarding vehicles are very specific: Only those over 25 years in age may be brought in to the USA without compilance to Federal Motor Vehicle Safety Standards (FMVSS).