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MG TD/TF 5 Speed Gearbox Conversion Kit

The MG T type 5 speed gearbox conversion kit has been developed as a further successor to the popular MGA and MGB 5 speed gearbox conversions designed and developed by Hi-Gear Engineering Ltd.

MG TD/TF 5 Speed Gearbox Conversion Kit

The kit is aimed at T type owners who really want to use their cars on modern roads including motorways and who do not want to be confined to secondary roads.

The TD and TF models drive beautifully but when on fast modern roads the engine revolutions become altogether too high for economy, comfort and engine life.

Two types of kit are available to cover TD and TF models.

Type 1 Kit

MG TD/TF 5 Speed Gearbox Conversion Kit

This type 1 conversion adapts a Ford Sierra Type 9 gearbox (5 speed, 1.6L & 1.8L: 1982-91, & 2.0L: 1982-87) to the XPAG and XPEG engines.

To enable the Ford gearbox to be fitted to the vehicle, the engine has to be moved approximately 10mm forward.

The kit has all the parts to enable this to be achieved safely and reliably together with all fasteners and fitting instructions for the competent owner to fit.

The Type 9 Ford gearbox is not part of the kit but is either supplied by the owner or Hi-Gear Engineering Ltd can supply the gearbox.

The vehicle speedometer will need recalibrating. Several companies are able to do this. Instructions on how to measure the vehicle speedometer characteristics for re-calibration are included together with the details of a suitable company to do the work.

The Type 1 Kit Comprises TD/TF:

  1. Cast aluminium Bell Housing
  2. Gasket, Bell Housing to gearbox
  3. Spigot bush
  4. Rear rubber gearbox mounting
  5. Modified front rubber engine mounting
  6. New gearbox support crossmember
  7. Two crossmember side supports/lockplates
  8. Engine mounting packing plate
  9. Exhaust support bracket
  10. Engine torque reaction bracket/bolt.
  11. Two floor rail support brackets
  12. Gear lever assembly.
  13. Clutch plate (for 7 1/4" or 8" pressure plate).
  14. Speedometer cable/circlip.
  15. Brake pipe (RHD only).
  16. Fan spacer (TF only) + bolts.
  17. Modified front wing tie bar (TF only).
  18. Propshaft.
  19. Gearbox cover in moulded ABS.
  20. All bolts and fasteners.
  21. Detailed fitting instructions.
  22. Loctite.

The Bell Housing is cast in LM25 high strength heat treated aluminium alloy and is robustly constructed. The standard MG 7 1/4" or 8" clutch cover are re-used. The standard clutch release bearing and cross shaft system are all retained.

The gear lever sits in the same place as usual, so the conversion is not easily detectable.

The gearbox supporting chassis tube is retained. The brackets welded to the tube have a small piece removed but will still be able to be re-used if needed.

Gear Ratios TD/TF Standard Ford Modified Ford Closer Ratio
First 3.5 3.65 2.98 3.36
Second 2.07 1.97 1.97 1.81
Third 1.385 1.37 1.37 1.26
Fourth 1.0 1.0 1.0 1.0
Fifth - 0.82 0.82 0.825

The conversion transforms the car into a usable cruiser. Other benefits include improved fuel consumption, less driver and passenger fatigue, less vibration, longer engine life and fewer broken crankshafts! Motorway cruising is enhanced by the fifth gear.

TD axle ratio 5.125:1

4th gear 14.42 mph/1000 rpm
5th gear 17.60 mph/1000 rpm
70 mph 4854 rpm (4th) ->3977 rpm (5th)

TD/TF axle ratio 4.875:1

4th gear 15.16 mph/1000 rpm
5th gear 18.48 mph/1000 rpm
70 mph 4617 rpm (4th) ->3787 rpm (5th)

TF 1500 axle ratio 4.55:1

4th gear 16.22 mph/1000 rpm
5th gear 19.78 mph/1000 rpm
70 mph 4315 rpm (4th) ->3538 rpm (5th)

The propeller shaft provided in the kit is to the original manufacturer's specification:

Torque: 570 Nm, 422lbft (short duration) MAXIMUM
Speed: 7000 Rpm MAXIMUM.

This corresponds to 5740 engine rpm in fifth gear (ratio 0.82:1) and 7000 engine rpm in fourth gear (ratio 1:1). For any higher values of torque or speed, Hi-Gear Engineering Ltd can refer the customer to the manufacturer.

Price Type 1 Kits: TD £1275.00 TF £1300.00 Plus delivery, packing and VAT @ 20%

Note: Chronometric Speedometers (Early TD).

This type of instrument is difficult to recalibrate. Hi-Gear Engineering has commissioned Speedograph Richfield to manufacture to order a small step up gearbox which will fit directly into the speedo cable entry point on the Ford type 9 gearbox. This gearbox will then drive the original cable to the speedometer. The owner sends his speedo together with calibration data obtained from the vehicle to Speedograph Richfield who will check the instrument and supply the step-up gearbox with correct ratio for accurate speed indication.

Type 2 Kit

We now can supply an alternative type of kit for TD and TF cars.

In this version the engine stays in its normal position. A piece approx. 200mm (8 inches) is removed centrally from the gearbox supporting chassis tube. This piece is removed and retained. It can be rewelded back into position if the car is required to be returned to original.

A new crossmember piece is supplied which bolts onto the two chassis tube stubs. This crossmember is very strong and restores the chassis strength to normal. The gearbox rubber mounting is attached to the crossmember. Floor rail supports are fixed to the crossmember.

The Type 2 Kit Comprises:

  1. Cast aluminium bell housing
  2. Gasket bell housing to gearbox
  3. Spigot bush
  4. Aluminium gearbox support crossmember
  5. Exhaust support bracket
  6. Gearbox rubber mount
  7. Two floor rail support brackets
  8. Gear lever assembly
  9. Clutch plate 7 1/4" or 8” clutch
  10. Speedometer cable/circlip
  11. Propshaft
  12. Gearbox cover in silicon rubber
  13. Bolts and fasteners
  14. Brake pipe (RHD only)
  15. Heat shield (RHD only)
  16. Detailed fitting instruction
  17. Loctite

Price Type 2 Kits: TD/TF (LHD) £1275.00, TD/TF (RHD) £1300.00. Plus delivery, packing and VAT @ 20%

MG TD/TF 5 Speed Gearbox Conversion Kit MG TD/TF 5 Speed Gearbox Conversion Kit

For more information on our gearbox conversions for classic MG cars
Call Hi-Gear Engineering Ltd on Tel: 01332 514 503

Suppliers of Five Speed Conversion Kits to:


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