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Triumph TR6 Overdrive Conversions & Electrics |
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'A' Type Overdrive Conversion Kit
'A' Type Overdrive Electrics 'J' Type Overdrive Conversion Kit
'J' Type Overdrive Electrics Overdrive Gearbox Cover Overdrive Conversion Bracket Kits
©Rimmer Bros Ltd - Registered in England No. 2155394. VAT No. GB 352 8473 40.
Overdrive Conversions
'A' Type Overdrive Conversion Kit
'J' Type Overdrive Conversion Kit
Other Items
Consumables
An overdrive conversion is among the most useful modifications that can be carried out on your TR6 and it is relatively straightforward to do. Overdrive provides useful additional gear ratios, for use under all driving conditions. Creeping about in town the use of 2nd overdrive and 2nd gear, on A type units only, saves on the continual 2nd to 3rd to 2nd gear changes. It nicely bridges that 2nd to 3rd speed ratio gap.
The 3rd gear gives that little extra help for high speed overtaking when an upward gear change could best be ignored. The 4th gear overdrive provides effortless high-speed cruising improving long distance touring fuel economy.
The A type overdrive unit was fitted as an option to the TR6 (CP/CC series pre 1973) and operates in 2nd, 3rd, and 4th gears. It provides a 22% reduction to the engine speed for a given road speed when engaged. The J type overdrive unit was fitted to TR6 (CR/CF series from 1973), operating on 3rd, and 4th gears only. It provides a 25% reduction to the engine speed for a given road speed when engaged.
To simply 'Bolt-On' an overdrive to your non-overdrive box is not possible since the mainshaft (output shaft) at the rear of the gearbox, is different. Whilst it is possible to adapt your existing gearbox for overdrive fitment, this does mean that a strip down is required to change the mainshaft. This, in effect, results in overhauling the gearbox (at least replacing bearings, synchro's etc. - see Gearbox Reconditioning Kits) prior to fitting the overdrive. This also assumes that your existing non-overdrive gearbox is to original specification (i.e., it has not been changed or rebuilt to a difficult specification by a previous owner) and that the overdrive mainshaft purchased is compatible with your unit. In real terms, it is easier (and usually more economical) to buy a complete, TR6 reconditioned gearbox and overdrive assembly which when purchased with a conversion kit saves all the trouble.
Our conversion kits not only include the gearbox/ overdrive unit assembly, but also wiring, column switch, solenoid, drive flange, speedo pinion, angle drive and speedo cable. Just about everything you will need! You should also consider replacing as a matter of course (purchasing separately), the clutch assembly and engine/gearbox rubber mountings whilst carrying out the conversion (refer to relevant sections). Depending on the vehicle chassis type and type of overdrive gearbox ('A' or 'J' type) to be fitted, it may be necessary to purchase separately the rear mounting bracketry.
Please note that our conversion kits are based on receiving and old gearbox in exchange - either a TR6 non-overdrive unit or a saloon (2500), Sprint or Stag type gearbox/overdrive assembly.
To select the type best suited to your car, the 'A' type conversion suits CP/CC series cars (pre 1973) and the 'J' type CR/CF models (1973 onwards). The positions of the chassis mounting brackets for the gearbox/overdrive are different, so selecting the "correct" overdrive conversion makes life easier, i.e. early (CP/CC) non-overdrive gearbox and chassis mountings are the same as the 'A' type overdrive, and late (CR/CF) the same a 'J' type. For the record, the 'J' type locates about 1 inch lower and 3 inches further back on the chassis than the 'A' type. The propshaft is the same for all applications and may be re-used if serviceable.
Recommended for (1969 to 1972) CP/CC series no. vehicles. Operates in 2nd, 3rd and 4th gears.
1. 
Overdrive Conversion Kit - (1) - RR1521RHD
Right Hand Drive.
Overdrive Conversion Kit - (1) - RR1521LHD
Left Hand Drive.
The kits includes the following parts (items 2-35) :-
2. Gearbox & Overdrive Assembly - (1) - RR1164R
Reconditioned exchange.
Supplied less clutch operating ancillaries, gear lever and gear lever retainer(swap over from old gearbox).
NOTE: Depending upon availability, the type of overdrive annulus fitted may differ from the original necessitating re-calibration of the speedometer.
3. Gear & Spindle Assembly - (1) - 147965
4. 'O' Ring (housing to extension) - (1) - 147751
5. Bearing Housing (speedo gear) - (1) - 146542
6. Oil Seal (spindle to bearing housing) - (1) - NKC105A
7. Screw (special. locating housing) - (1) - 506071
8. Washer (copper, sealing screw) - (1) - 506108
9. Angle Drive - (1) - 120694
10. Washer (sealing) - (1) - 500463
11. Speedometer Cable - (1) - GSD169
12. Flange (mainshaft, square) - (1) - 58948
To gearbox no. CD15651, serial no. 22/61753.
13. Flange (mainshaft, round) - (1) - 518109
From gearbox no. CD15652, serial no. 22/61985.
14. Washer (plain) - (1) - WP24
15. Nut (slotted) - (1) - 57868
16. Nut (nyloc) - (1) - 157642
Alternative.
17. Split Pin - (1) - PC12
Use with slotted nut.
18. Solenoid (overdrive operating) - (1) - 112946
19. Gasket (solenoid to bracket) - (1) - 513201
20. Screw (solenoid to bracket) - (2) - 513226
21. Washer (locking) - (2) - 513903
22. Loom (overdrive, on gearbox) - (1) - 131339
23. Connector (loom, single line) - (4) - 104618
24. Loom (overdrive, on body) - (1) - 148696
25. Grommet (loom to switches) - (1) - 612715
26. 'P' Clip (loom to gearbox top cover) - (1) - 100148
27. Switch (isolator, overdrive operation) - (3) - BAU1074A
28. Washer (sealing/adjusting, switch) - (3) - 502146
29. Switch (overdrive, RH steering) - (1) - 147280
Switch (overdrive,LH steering) - (1) - 147281
30. Escutcheon (overdrive switch) - (1) - 611974
31. Relay - (1) - 126792
32. Screw (relay attachment) - (2) - PX505
33. Washer (plain) - (2) - WP5
34. Washer (locking) - (2) - WL205
35. Nut - (2) - HN2005
Recommended for (1973 to 1976) CR/CF series no. vehicles. Operates in 3rd and 4th gears only.
36. Overdrive Conversion Kit - (1) - RR1522RHD
Right Hand Drive.
Overdrive Conversion Kit - (1) - RR1522LHD
Left Hand Drive.
The kits includes the following parts (items 37-64) :-
37. Gearbox & Overdrive Assembly - (1) - RR1089R
Reconditioned exchange.
Supplied less clutch operating ancillaries, gear lever and gear lever retainer(swap over from old gearbox).
38. Stud (overdrive to chassis mounting) - (2) - 160219
39. Washer (locking) - (2) - GHF333
40. Nut - (2) - GHF202
41. Pinion & Gear Assembly - (1) - NKC48
Speedometer drive.
42. Speedo Drive Housing Assembly - (1) - NKC42
43. Retainer Assembly - (1) - NKC43
44. Screw (attaching retainer) - (1) - NKC80
45. Washer (locking) - (1) - NKC70
46. Angled Speedometer Drive - (1) - 120694
47. Washer (sealing) - (1) - 500463
48. Speedometer Cable - (1) - GSD169
49. Flange (mainshaft, round) - (1) - 160292
50. Washer - (1) - NKC82A
51. Nut (nyloc) - (1) - NKC81
52. Solenoid and Valve Assembly - (1) - NKC41
53. Washer (copper) - (1) - NKC108
54. 'O' Ring - (2) - NKC107
55. Wire (solenoid earthing) - (1) - NKC67
56. Loom (overdrive, on gearbox) - (1) - UKC344
57. Connector (loom, single line) - (4) - 104618
58. Loom (overdrive, on body) - (1) - UKC345
59. Grommet (loom to switches) - (1) - 612715
60. 'P' Clip (loom to gearbox top cover) - (1) - 100148
61. Switch (overdrive isolater & reverse light) - (2) - BAU1074A
62. Washer (switch adjusting) - (2) - 502146
63. Switch (overdrive, RH steering) - (1) - 147280
Switch (overdrive, LH steering) - (1) - 147281
64. Escutcheon (overdrive switch) - (1) - 611974
65. Gearbox Cover (fibreglass replacement) - (1) - 713569FG
Gearbox Cover (fibreglass replacement) - (1) - 713569PL
66. Fitting Kit (gearbox cover) - (1) - 713569FK
67. Seal Kit (gearbox cover) - (1) - 713569SK
68. Bracket & Fitting Kit - (1) - 211361X
Allows J type overdrive to fit to 'A' type chassis (CP/CC) without modification. Comes complete with mounting.
69. Bracket - (1) - 218275X
Allows an 'A' type TR overdrive to fit to 'J' type chassis. Fits into existing cotton reel type mountings (part no. 150403).
Will require additional purchase of 104086 mounting.
70. Bracket & Fitting Kit - (1) - 218275XS
This kit is required if a 2000/2.5 saloon 'J' type overdrive is being fitted to a J type TR6 chassis. The kit comprises the converter bracket, a rubber mounting and fitting hardware.
71. Bracket - (1) - RR1314
Allows a saloon 'A' type overdrive casing to fit the TR mounting, 104086 (minor rear casing alterations are required).
72. WD40 (400ml can) - (ar) - GAC111
73. Instant Gasket (80ml) - (ar) - GHF6093
74. Studloc (Loctite, 10ml) - (ar) - GAC100
75. Hypoid 90 Gear Oil (0.50litre) - (ar) - GGL190
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The 'Triumph', 'Rover' and 'British Motor Heritage' Logos used herein are Registered Trade Marks of British Motor Heritage Ltd,
and are used with their Licence under the Special 'Heritage' approval Scheme.
All original part numbers & illustrations have been reproduced by kind permission of British Motor Heritage.