MGB V8 5 Speed Mazda Gearbox Conversion Kit


Prices are exclusive of VAT

Available - Despatched 1-2 business days after order receipt
SKU vitmgb251V8

Vitesse Gearbox Conversion Kit using the proven Mazda MX-5 Mk3 5 Speed Transmission.

Now with a period correct gear knob to perfectly complement your vehicle's interior.

Suitable for all MGB V8s, including conversions. 






Our kit includes the following:

  • NEW Mazda MX-5 5 Speed Transmission:
    • Vitesse Gearbox Case
    • Vitesse Bellhousing
    • Vitesse Machined Billet Front Plate
    • Modified rear case with Mazda mechanical Speedo Drive Assembly
  • Bespoke Clutch Friction Plate
  • OE Clutch Cover
  • Bellhousing Dirt Shield
  • Bespoke Shift Lever and Shift Knob kept in original position
  • Concentric Slave Cylinder Assembly
  • Braided Clutch Pipe and remote Bleed Pipe for easy bleeding
  • Bespoke Prop Shaft
  • Spigot Bush with Mazda OE needle roller bearing assembly
  • Speedo Drive Cable and Angle Drive
  • Gearbox Rear Mount Bracket Assembly and Isolator
  • Complete Geomet coated UNF fixings kit
  • Clutch Alignment Tool


The gearbox comes fully assembled including the clutch slave cylinder assembly so the fitting is only as complicated as replacing an original gearbox. We even include a Mazda clutch alignment tool to assist with assembly!

We use all OE Mazda components where possible, ensuring parts quality and also serviceability.

All brackets are electrocoated ensuring maximum resistance to corrosion.


The all alloy case means significant weight savings can be achieved with this kit- up to 23kg compared to the R380! 

Vitesse MGB V8 Kit Weights

Gear Ratios: 

Gear Ratio - Mazda Transmission 
1 3.136
2 1.888
3 1.330
4 1.000
5 0.814


The standard MGB V8 differential has a ratio of 3.07:1, so the gear ratios work perfectly in the MG, utilising the extra torque delivery of the V8.


12 months manufacturing defect warranty offered on all parts.

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