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Engine, Transmission, wheels/Tyres and Heating/Cooling

TR4A Plate BK - OVERDRIVE: OVERDRIVE UNIT DETAILS (independent rear axles only).

  Plate No. Part No. Description and Comments No Per Unit Price Add to Cart
BK1AA
307603

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OVERDRIVE UNIT ASSEMBLY

Triumph Catalogue Remarks: For independent rear axles only
Revington TR information: Not available new. Please call or email for options

1  
No longer available 
BK1
112946

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Solenoid

This item has been superceded by 508794 - currently not available

1  
BK1A
513226

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Screw, set Securing solenoid to bracket

This item has been superceded by SH603041 - currently not available

2  
BK1B
513903

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Washer, lock Securing solenoid to bracket

This item has been superceded by WL105001 - currently not available

2  
BK2
109521

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Cover, rubber, solenoid

Revington TR information: Consider Second hand part 109521SH.

1  
No longer available 
BK3
208098

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Plate, adaptor, overdrive unit to gearbox

Revington TR information: consider second hand part 208098SH
This item has a secondhand part available - currently not available

1

£175.64

Ex VAT @ 20%
£146.37

Currently unavailable 
BK4
502556

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Washer, joint, between adaptor plate and front casing assy.

1

£2.46

Ex VAT @ 20%
£2.05



BK5
503159

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Casing, front, assembly

This item has been superceded by RTR1276 - currently not available

1  
BK6
500576

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Stud, 2 5/8" Adaptor plate attachment

2

£4.18

Ex VAT @ 20%
£3.48



BK7
500666

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Stud, 1" Adaptor plate attachment

1

£3.11

Ex VAT @ 20%
£2.59

Currently unavailable 
BK8
500578

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Stud, 1 1/4" Adaptor plate attachment

This item has been superceded by ST605101 - currently not available

3  
BK9
WL0208

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Washer, lock Adaptor plate attachment

This item has been superceded by WS105090853 - currently not available

6  
BK10
HN2008

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Nut

This item has been superceded by NP605081 - currently not available

6  
BK11
500570

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Plug, welch, in casing

Revington TR information: No longer available

1  
No longer available 
BK39
513904

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Plug, oil drain

This item has been superceded by 521814 - currently not available

1  
BK40
500641

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Washer, drain plug

1

£1.03

Ex VAT @ 20%
£0.86



BK41
515131

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Spring, pressure, accumulator

1

£33.12

Ex VAT @ 20%
£27.60

Currently unavailable 
BK42
501909

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MORE INFO

Piston assembly, accumulator

Revington TR information: This item has a secondhand part available - currently not available

1

£113.35

Ex VAT @ 20%
£94.46

Currently unavailable 
BK43
505555

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Ring, piston

1 set

£81.91

Ex VAT @ 20%
£68.26

Currently unavailable 
BK44
501908

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Housing assembly, accumulator

Revington TR information: This item has a secondhand part available - currently not available

1

£69.00

Ex VAT @ 20%
£57.50

Currently unavailable 
SK45
501910

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MORE INFO

"0" Ring

1

£3.28

Ex VAT @ 20%
£2.73

Currently unavailable 
BK46
502563

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Spacing tube, and washer assembly

1

£33.05

Ex VAT @ 20%
£27.54



BK47
502566

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Bracket assembly-solenoid

1

£121.15

Ex VAT @ 20%
£100.96

Currently unavailable 
BK48
500645

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washer, Joint, side cover

1

£1.03

Ex VAT @ 20%
£0.86



BK49
500577

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Stud Attaching solenoid bracket to front casing

This item has been superceded by ST605111 - currently not available

2  
BK50
HN2008

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Nut Attaching solenoid bracket to front casing

This item has been superceded by NP605081 - currently not available

2  
BK51
WL0208

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Washer, lock Attaching solenoid bracket to front casing

This item has been superceded by WS105090853 - currently not available

2  
BK52
103268

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Screw, set Attaching solenoid bracket to front casing

This item has been superceded by SH605141 - currently not available

2  
BK53
WP0008

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Washer, plain Attaching solenoid bracket to front casing

This item has been superceded by WP10510075 - currently not available

2  
BK54
WL0208

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Washer, lock Attaching solenoid bracket to front casing

This item has been superceded by WS105090853 - currently not available

2  
BK55
513918

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Adjusting screw Solenoid

Revington TR information: No Longer Available

1  
No longer available 
BK56
513919

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MORE INFO

Nut, lock Solenoid

1  
No longer available 
BK56A
502560

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Breather

1

£11.62

Ex VAT @ 20%
£9.68

Currently unavailable 
BK57
513890

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Piston, operating, assembly

2

£34.60

Ex VAT @ 20%
£28.83

Currently unavailable 
BK58
513912

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MORE INFO

"0" Ring

2

£1.72

Ex VAT @ 20%
£1.43

Currently unavailable 
BK59
500660

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MORE INFO

Ring, clutch thrust, assembly, with pins

1

£167.90

Ex VAT @ 20%
£139.92

Currently unavailable 
BK60
50058'!
Piece, bridge

2  
No longer available 
BK61
502554

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MORE INFO

Spring, clutch, set

Revington TR information: Set of 8 overdirve springs Kit of 8 springs. Overall length 114mm. 4 springs are approx 2mm wire thickness and the other 4 springs 2.4mm wire thickness. Flat at either end. 31 turns. for... READ MORE
This item has a secondhand part available - currently not available

1 set

£71.92

Ex VAT @ 20%
£59.93



BK62
HN2007

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Nut Clutch thrust ring attachment

This item has been superceded by NP604071 - currently not available

4  
BK63
500642

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Washer, tab Clutch thrust ring attachment

This item has been superceded by NS604061 - currently not available

4  
BK64
500640

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Bearing, ball, clutch thrust ring

Revington TR information: Call for price and availability.

1

£50.10

Ex VAT @ 20%
£41.75

Currently unavailable 
BK65
500636

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MORE INFO

Circlip Ball bearing location

1

£2.41

Ex VAT @ 20%
£2.01



BK66
500637

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Circlip Ball bearing location

1

£16.19

Ex VAT @ 20%
£13.49



BK67
502555

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Ring, brake, clutch

1

£206.44

Ex VAT @ 20%
£172.03

Currently unavailable 
BK68
500661

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MORE INFO

Clutch assembly, sliding member with linings

Revington TR information: Overdrive 'A' type cone clutch. Not available new use 500661EX, 500661SH or RTR1277. Press click 'MORE' for details
This item has a secondhand part available - currently not available

1  
No longer available 
BK69
500602

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MORE INFO

Annulus assembly

Revington TR information: Consider Exchange part RTR1104EX. press 'READ MORE' for more details

1  
No longer available 
BK70
505545

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carrier assembly Planet

This item has been superceded by 505545SH - currently not available

1  
BK70A
513224

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Bearing, planet carrier

This item has been superceded by 505546 - currently not available

6 sets  
BK70B
513914

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Washer, thrust

This item has been superceded by 505546 - currently not available

3  
BK71
500611

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Washer, thrust

This item has been superceded by 505548 - currently not available

1  
BK72
505549

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Sunwheel assembly

Revington TR information: use 505549SH
This item has a secondhand part available - currently not available

1  
No longer available 
BK73
500588A

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Washer,, adjusting, front of Sunwheel .113/.114"

as req'd

£14.39

Ex VAT @ 20%
£11.99



BK73
5005888
Washer,, adjusting, front of Sunwheel .107/.108"

as req'd  
No longer available 
BK73
500588C

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Washer,, adjusting, front of Sunwheel .101/.102"

as req'd

£13.45

Ex VAT @ 20%
£11.21



BK73
500588D

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Washer,, adjusting, front of Sunwheel .095/.096"

as req'd

£13.45

Ex VAT @ 20%
£11.21



BK73
500588E

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Washer,, adjusting, front of Sunwheel .089/.090"

as req'd

£13.45

Ex VAT @ 20%
£11.21



BK73
500588
Washer,, adjusting, front of Sunwheel .083/.084'

as req'd  
No longer available 
BK73
500588G

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Washer,, adjusting, front of Sunwheel .077/.078"

as req'd

£13.45

Ex VAT @ 20%
£11.21



BK74
500610

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Washer, thrust, sunwheel

1

£21.05

Ex VAT @ 20%
£17.54



BK75
502558

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Clutch, uni-directional Inner member

This item has been superceded by BAU2061A - currently not available

1  
BK76
502550

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Roller, set

This item has been superceded by 506063A - currently not available

1  
BK77
502559

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Cage, roller

Revington TR information: Use assembly BAU2061A

1  
No longer available 
BK78
500630

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Spring, clutch

1  
No longer available 
BK79
500613

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Washer, thrust, rear of uni-directional clutch

This item has been superceded by 500613A - currently not available

1  
BK80
SP74G

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Bearing, ball, front, for annulus

1

£33.52

Ex VAT @ 20%
£27.93

Currently unavailable 
BK81
513897

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Bearing, ball, rear, for annulus

This item has been superceded by SP75G - currently not available

1  
BK82
500623/E

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Washer, adjusting annulus end float .146"

This item has been superceded by 500623E - currently not available

as req'd  
BK82
500623/F

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Washer, adjusting annulus end float .151"

This item has been superceded by 500623F - currently not available

as req'd  
BK82
500623/G

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Washer, adjusting annulus end float .156"

This item has been superceded by 500623G - currently not available

as req'd  
BK82
500623/H

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Washer, adjusting annulus end float .161"

This item has been superceded by 500623H - currently not available

as req'd  
BK82
500623/I
Washer, adjusting annulus end float .166

as req'd  
No longer available 
BK83
500655

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Casing, rear, with studs

Revington TR information: Consider Exchange part RTR1105EX The speedometer drive exits this casing pointing downwards where as the saloon rear casing has the speedometer exit horizontally. For a rally car where it is intended that the speedometer cable should run... READ MORE

1

£311.06

Ex VAT @ 20%
£259.22

Currently unavailable 
BK84
500756

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Stud Rear casing attachment

This item has been superceded by ST605121 - currently not available

4  
BK85
500579

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Stud Rear casing attachment

2  
No longer available 
BK86
HN2008

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Nut Rear casing attachment

This item has been superceded by NP605081 - currently not available

6  
BK87
WL0208

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Washer, lock Rear casing attachment

This item has been superceded by WS105090853 - currently not available

6  
BK88
513898

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Seal, oil, In rear casing

This item has been superceded by 146129 - currently not available

1  
BK88A
058948

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Flaw., mainshaft

Revington TR information: Square Gearbox/Overdrive output flange. TR2-6 all non-overdrive gearboxes and all 'A' type overdrive gearboxes up to Gearbox number CD15651 with O/D number 22/61953. Not available new. Consider second hand part 058948SH or the interchangeable later TR6... READ MORE
This item has a secondhand part available - currently not available

1  
No longer available 
BK88B
057868

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Nut, slotted Securing flange to mainshaft

Revington TR information: see also 057868SH
This item has a secondhand part available - currently not available

1

£6.78

Ex VAT @ 20%
£5.65

Currently unavailable 
BK88C
WP0024

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Washer, plain Securing flange to mainshaft

1

£1.03

Ex VAT @ 20%
£0.86

Currently unavailable 
BK88D
P00012

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MORE INFO

Pin, split Securing flange to mainshaft

This item has been superceded by PS108091 - currently not available

1  
OVERDRIVE GEARBOX ASSEMBLY (Lees Gear Lover)

Triumph Catalogue Remarks: For details see Gearbox Section.