CP/CC 1969 to 1972
The 'A' Type overdrive unit that was fitted as an option to the TR6 PI cars operates in 2nd, 3rd and 4th gears. It provides a 22% reduction ratio to the engine speed for a given road speed when engaged. The reduction ratio is signified by the serial number prefix of the Laycock unit, In the case of the 'A' Type this is 22/, other cars used a different ratio unit, notably the Standard Vanguard at 28%, whose serial number begins 28/...... Overdrive gives 3 useful additional gear ratios, for use under all driving conditions. Creeping about in town the use of 2nd overdrive and 2nd gear saves on the continual 2nd to 3rd to 2nd gear changes. It nicely bridges that 2nd to 3rd speed ratio gap. The 4th gear overdrive provides effortless high speed long distance touring economy. The 3rd gear gives that little extra help for high speed overtaking when an upward gear change could best be ignored.

1. Overdrive Unit ('A' type, new) - (1) - 309159
Up to gearbox no. CD15651, serial no. 22/61753.
Overdrive Unit ('A' type, reconditioned, exchange) - (1) - 309159R
Up to gearbox no. CD15651, serial no. 22/61753.
Overdrive Unit ('A' type, new) - (1) - 312373
From gearbox no. CD15652, serial no. 22/61985.
Overdrive Unit ('A' type, reconditioned, exchange) - (1) - 309159R
From gearbox no. CD15652, serial no. 22/61985.
NOTE: Depending upon availability the type of annulus fitted to reconditioned exchange overdrives may differ from original necessitating recalibration of speedometer. After initialisation, it is important to set up the actuation valve lever accurately to ensure correct operation. Ensure gearbox is clean internally before fitting overdrive - avoiding cross-contamination from dirty oil.

2. Gasket (adaptor plate to gearbox) - (1) - 132465

3. Mainshaft (overdrive) - (1) - 208052
To gearbox no. CD20281.
Mainshaft (overdrive) - (1) - UKC1933
From gearbox no. CD20282.

4. Solenoid (overdrive operating) - (1) - 109521
5. Plunger Only - (1) - 109521PLUNGER
6. Cover (rubber, solenoid wiring) - (1) - 112946
7. Boot (solenoid plunger) - (1) - 109521
8. Gasket (solenoid to bracket) - (1) - 513201
9. Screw (solenoid to bracket) - (2) - 513226
10. Washer (locking) - (2) - 513903
11. Gear & Spindle Assembly - (1) - 147965
12. 'O' Ring (housing to extension) - (1) - 147751
13. Bearing Housing (speedo gear) - (1) - 146542
14. Oil Seal (spindle to bearing housing) - (1) - NKC105A
15. Screw (special, locating bearing housing) - (1) - 506071
16. Washer (copper. sealing screw) - (1) - 506108
17. Angle Drive - (1) - 120694
18. Washer (sealing) - (1) - 500463

19. Speedometer cable (63") - (1) - GSD109
RH steering.
Speedometer Cable (69") - (1) - GSD169
LH steering.
The 69" long speedometer cable is the one preferred for RH steering cars as it allows that little extra length when routing. Remember all cables must be securely clipped to prevent chaffing or snagging.

Adaptor Plate & Casings

20. Adaptor Plate (overdrive to gearbox) - (1) - 208098

To gearbox no. CD15651.

Adaptor Plate (overdrive to gearbox) - (1) - 500654

From gearbox no. CD15652.

21. Screw ('Locwel') - (6) - WX4857

Screw (plain) - (6) - HU857

Alternative.

22. Washer (plain) - (6) - WP107

Use with 'Locwel' screw.

23. Washer (locking) - (6) - WL208

Use with plain screw.

24. Gasket (adaptor to overdrive) - (1) - 502556

25. Casing Assembly (front) - (1) - 503159

To gearbox no. CD15651, serial no. 22/61753.

Casing Assembly (front) - (1) - 520679

From gearbox no. CD15652, serial no. 22/61985.

26. Nameplate (black) - (1) - CRST265

Serial no. 22/61753.

27. Nameplate (blue) - (1) - CRST266

Serial no. 22/61985.

28. Screw (drive, securing nameplate) - (2) - FAS2

29. Plug (welch) - (1) - 500570

30. Stud (2 5/8" long) - (2) - 500576

31. Stud (1" long) - (1) - 500666

32. Stud (1 1/4" long) - (3) - 500578

33. Nut - (6) - HN2008

34. Washer (locking) - (6) - WL208

35. Shaft (operating) - (1) - 513908

36. Lever (adjustment setting) - (1) - 513909

37. Mills Pin (adjustment lever) - (1) - 513888

38. Cam (on shaft) - (1) - 513910

39. Pin (cam to shaft) - (1) - 500593

40. Gasket (solenoid bracket to casing) - (1) - 500645

41. Bracket (solenoid mounting) - (1) - 502566

42. Dowel Pin - (1) - DP408

43. Stud (bracket assembly) - (2) - 500577

44. Washer (locking) - (2) - WL208

45. Nut - (2) - HN2008

46. Screw (bracket to body) - (2) - 103268

47. Washer (locking) - (2) - WL208

48. Washer (plain) - (2) - WP8

49. Stone Shield - (1) - 502569

50. 'O' Ring (operating shaft) - (2) - 500594

51. Collar (for shaft) - (1) - 502567

52. Lever (actuating) - (1) - 502568

53. Bolt (clamping, lever to shaft) - (1) - 503163

54. Washer (plain) - (1) - 505550

55. Nut - (1) - 503164

56. Screw (adjusting, solenoid stop) - (1) - 513918

57. Nut (locking) - (1) - 513919

58. Rear Casing Assembly - (1) - 500655

59. Stud (rear casing, upper) - (4) - 500756

60. Stud (rear casing, lower) - (2) - 500579

61. Nut - (6) - HN2008

62. Washer (locking) - (6) - WL208

Operating Valve, Oil Pump & Filter

63. Valve 9operating) - (1) - 500658

64. Ball (operating valve) - (1) - BLS110

65. Plunger (operating valve) - (1) - 500591

66. Spring (operating valve) - (1) - 506070

67. Washer (sealing) - (1) - 500568

68. Plug (operating valve) - (1) - 506117

69. Cam (overdrive oil pump driving) - (1) - 500627

70. Plunger Assembly (oil pump) - (1) - 513891

71. Spring (pump plunger) - (1) - 500633

72. Guide (peg) - (1) - 500581

73. Body (oil pump) - (1) - 505507

74. Washer (locking) - (2) - 513903

75. Screw (oil pump to body) - (2) - 513225

76. Plug (in pump body) - (1) - 513902

77. Filter - (1) - 509884

To gearbox no. CD15651, serial no. 22/61753.

Filter - (1) - 516010

From gearbox no. CD15652, serial no. 22/61985.

78. Magnet - (1) - 513205

79. Washer (fibre) - (1) - 500641.

80. Cap (oil drain) - (1) - 513904

81. Spanner (oil drain cap) - (1) - TMG4901

82. Ball (pump valve) - (1) - BLS108

83. Plunger (pump valve) - (1) - 500591

84. Spring (pump valve) - (1) - 506070

85. Washer (sealing) - (1) - 500568

86. Plug (pump valve) - (1) - 506117

Accumulator & Operating Pistons

87. Housing (accumulator) - (1) - 501908

88. 'O' Ring - (1) - 501910

89. Accumulator Piston - (1) - 501909

90. Piston Ring Set - (1) - 505555

91. Spacing Tube - (1) - 502563

92. Spring (accumulator) - (1) - 518601

To gearbox no. CD15651, serial no. 22/61753.

Spring (accumulator) - (1) - 518601

From gearbox no. CD15652, serial no. 22/61985.

93. Washer (packing) - (ar) - 513900

94. Breather - (1) - 502560

This breather is always fitted to TR overdrives.

Triumph saloon models 2000 and 2.5 always had a an 3/8 AF squared headed plug. This is another clue to the origin of your overdrive.

95. Operating Piston (including 'O' ring) - (2) - 513890

96. 'O' Ring - (2) - 513912

Sunwheel & Planet Carrier

97. Sunwheel Assembly - (1) - 505549

98. Washer (thrust) - (1) - 500610

99. Washer (adjusting 0.113/0.114) - (ar) - 500588A

Washer (adjusting 0.107/0.108) - (ar) - 500588B

Washer (adjusting 0.101/0.102) - (ar) - 500588C

Washer (adjusting 0.095/0.096) - (ar) - 500588D

Washer (adjusting 0.089/0.090) - (ar) - 500588E

Washer (adjusting 0.083/0.084) - (ar) - 500588F

Washer (adjusting 0.077/0.078) - (ar) - 500588G

100. Carrier Assembly (planet gears) - (1) - 505545

To gearbox no. CD15651, serial no. 22/61753.

Carrier Assembly (planet gears) - (1) - 518600

From gearbox no. CD15652, serial no. 22/61985.

101. Bearing, Shaft & Thrust Washer Kit (planet gears) - (1) - 518106

102. Bearing Assembly - (1) - 513224

103. Thrust Washer - (3) - 513914

104. Thrust Washer - (1) - 500611

Uni- Directional Clutch

105. Clutch Assembly (uni-directional) - (1) - 502558

106. Cage (roller retaining) - (1) - 502559

To gearbox no. CD15651, serial no. 22/61753.

Cage (roller retaining) - (1) - 518110

From gearbox no. CD15652, serial no. 22/61985.

107. Spring (cage locating) - (1) - 500630

108. Roller Set (set of 12) - (1) - 502550

109. Thrust Washer - (1) - 500613

Brake Ring & Clutch Sliding Member

110. Brake Ring - (1) - 502555

111. Ring Assembly (clutch thrust with pins) - (1) - 500660

112. Spring Set (clutch operating, set of 8) - (1) - 502554

113. Bridge Piece - (2) - 500587

114. Washer (tab, locking nut) - (4) - 500642

115. Nut - (4) - HN2007

116. Nut (locking) - (4) - JS616A

Alternative to plain nut and tab washer.

117. Circlip (ball bearing retaining) - (1) - 500636

118. Bearing Assembly (clutch thrust ring) - (1) - 500640

119. Circlip (ball bearing retaining) - (1) - 500637

120. Clutch Assembly (sliding member) - (1) - 500661

New. To gearbox no. CD15651, serial no. 22/61753.

Clutch Assembly (sliding member) - (1) - 500661R

Reconditioned exchange. To gearbox no. CD15651, serial no. 22/61753.

Clutch Assembly (sliding member) - (1) - 518107

New. From gearbox no. CD15652, serial no. 22/61985.

Clutch Assembly (sliding member) - (1) - 518107R

Reconditioned exchange. From gearbox no. CD15652, serial no. 22/61985.

Clutch Assembly (sliding member) - (1) - 520975

New. Alternative.

Clutch Assembly (sliding member) - (1) - 520975R

Reconditioned exchange. Alternative.

Annulus & Rear Flange

121. Annulus Assembly - (1) - 500602

122. Ring (outer, uni-directional clutch) - (1) - 500602X

123. Bearing Assembly (annulus front) - (1) - SP74G

124. Washer (adjusting 0.146) - (ar) - 500623E

Washer (adjusting 0.151) - (ar) - 500623F

Washer (adjusting 0.156) - (ar) - 500623G

Washer (adjusting 0.161) - (ar) - 500623H

Washer (adjusting 0.166) - (ar) - 500623J

125. Bearing Assembly (annulus rear) - (1) - 513897

126. Oil Seal - (1) - 513898

127. Flange (mainshaft, square) - (1) - 58948

To gearbox no. CD15651, serial no. 22/61753.

128. Flange (mainshaft, round) - (1) - 518109

From gearbox no. CD15652, serial no. 22/61985.

129. Washer (plain) - (1) - WP24

130. Nut (slotted) - (1) - 57868

131. Nut (nyloc) - (1) - 157642

Alternative.

132. Split Pin (use with slotted nut) - (1) - PC12

Overdrive Overhaul Kits

133. Overdrive Overhaul Kit - (1) - RR1517

The above kit contains the following parts :-

2. Gasket (adaptor plate to gearbox) - (1) - 132465

12. 'O' Ring (housing to extension) - (1) - 147751

14. Oil Seal (spindle to bearing housing) - (1) - NKC105A

24. Gasket (adaptor plate to overdrive) - (1) - 502556

40. Gasket (solenoid bracket to casing) - (1) - 500645

79. Washer (fibre) - (1) - 500641

80. 'O' Ring - (1) - 501910

90. Piston Ring Set - (1) - 505555

92. Spring Accumulator - (1) - 518601

94. Breather - (1) - 502560

96. 'O' Ring - (2) - 513912

109. Thrust Washer - (1) - 500613

112. Spring Set (clutch operating, set of 8) - (1) - 502554

117. Circlip (ball bearing retaining) - (1) - 500636

119. Circlip (ball bearing retaining) - (1) - 500637

123. Bearing (annulus, front) - (1) - SP74G

124. Washer (adjusting, 0.166) - (1) - 500623J

125. Bearing (annulus rear) - (1) - 513897

126. Oil Seal - (1) - 513898

134. Overdrive Seal & Gasket Kit - (1) - RR1518

The above kit contains the following parts :-

2. Gasket (adaptor plate to gearbox) - (1) - 132465

12. 'O' Ring (housing to extension) - (1) - 147751

14. Oil Seal (spindle to bearing housing) - (1) - NKC105A

24. Gasket (adaptor plate to overdrive) - (1) - 502556

40. Gasket (solenoid bracket to casing) - (1) - 500645

79. Washer (fibre) - (1) - 500641

88. 'O' Ring - (1) - 501910

96. 'O' Ring - (2) - 513912

126. Oil Seal - (1) - 513898

Consumables

135. WD40 (400ml can) - (ar) - GAC111

136. Jointing Compound (80ml) - (ar) - GHF6093

137. Studloc (Loctite, 10ml) - (ar) - GAC100

138. Hypoid 90 Gear Oil (0.5 litre) - (ar) - GGL190

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