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MGB Five Speed Conversion Kit

Two kits are available to cover all 4 synchro MGB cars with the wider gearbox tunnel and the 3 synchro models with the narrow tunnel.

The conversion adapts a Ford Sierra type 9 gearbox (5-speed fully synchronized) to the MGB engine

The standard ratios of the Sierra gearbox suit the MGB well with a 10% higher second gear for better overtaking. The 5th gear ratio is exactly the same as the MGB overdrive ratio

The conversion is totally non-intrusive to the MGB. There are no holes to drill, no metal to cut or remove. With the conversion kit installed the clutch plate can be replaced without removing the engine.

We offer expert advice and are available to help during the installation process. Call us at 904-282-1658 or 904-613-9591 (cell).

Prices(Kit includes standard gear box):
  • MGB - $3095.00
  • Close Ratio gear box - add $395.00
(All prices subject to change)

Questions? Ready to Order? Call 904-282-1658 or email us by clicking here

The Kit includes:

  1. Ford Sierra type 9 gearbox
  2. Cast aluminum Bell Housing
  3. Clutch release lever pivot & bolt
  4. Gasket, Bell Housing to gearbox
  5. Extended spigot bush
  6. Rear rubber gear box mounting
  7. New gearbox support cross member/clamp plates
  8. Cross member spacer
  9. Modified gear lever assembly
  10. New prop shaft assembly
  11. Speedometer cable/circlip
  12. All bolts and fasteners
  13. Detailed fitting instructions
  14. Loctite (2 types)
Gear MGB Std. Ford Close Ratio
First
3.44
3.65
3.36
Second
2.167
1.97
1.81
Third
1.382
1.37
1.26
Fourth
1.0
1.0
1.0
Fifth  
.82
.825