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Hi-Gear Engineering produces a range of 5 speed gearbox conversions for the following cars: MGTC, MGTD, MGTF, MGA, MGB, MG MAGNETTE (Z).
Each conversion kit contains all the parts necessary to adapt a Ford Sierra (Type 9) 5 speed gearbox to the MG car and engine. Gearboxes can be supplied in standard ratio or a variety of alternative ratios to suit the vehicle power and purpose. The kits require little or no vehicle modification and are reversible. They are sold all over the world. 3,000 sold to date.