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Five Speed Mazda Gearbox Conversion For MGB

We are pleased to offer these new 5 speed gearbox conversion kit based on the Mazda MX-5 gearbox. The conversion uses a brand new MX-5 gearbox, giving the MGB the slick gear change that has become synonymous with the MX-5, and a relaxed cruising 5th gear.

The kit is supplied with a fully assembled gearbox with a bespoke cast bell housing & casing designed to fit directly to the MGB’s engine back plate. The bell housing flange has been designed to resemble the standard gearbox, preserving engine bay originality.

The conversion uses the standard MGB flywheel & clutch cover and a new OE Mazda clutch plate is supplied with the kit. Installation is simplified with no cutting or permanent modifications required. Many of the components are preassembled to the gearbox and only require connections to the car.

The kit includes:

  • Brand new Mazda 5 Speed gearbox assembled into custom casing & bell housing
  • Concentric clutch slave cylinder assembled with pipework
  • Mazda OE clutch plate
  • Mazda OE gear knob
  • Custom gearbox mountings
  • Speedo drive & cable
  • Bespoke propshaft
  • All parts & hardware for installation

Please Note: The gearbox's are prefilled with SAE 75W-90 oil.
  Description Price Qty  
Five Speed Mazda Gearbox Conversion Part Number: TMK30719 Notes: 
3 Main Bearing Engine
Banjo Axle
Application: 
MGB 1962-65
£2,394.00
Five Speed Mazda Gearbox Conversion Part Number: TMK30720 Notes: 
5 Main Bearing Engine
Banjo Axle
Application: 
MGB 1965-68
£2,394.00
Five Speed Mazda Gearbox Conversion Part Number: TMK30721 Notes: 
5 Main Bearing Engine
Tube Axle
Application: 
MGB 1968-80
£2,394.00
Five Speed Mazda Gearbox Conversion Part Number: TMK30722 Notes: 
V8 Engine
Straight Six
Salisbury Axle
Application: 
MGB GT V8
MGC
£2,700.00
Five Speed Mazda Gearbox Conversion Part Number: TMK30723 Notes: 
V8 Engine
Salisbury Axle
Application: 
MGB converted to MGB GT V8
£2,700.00