'D' Type Overdrive Re-Builds
Overdrives require specialist knowledge to dismantle & re-build, and are normally beyond the ability of the DIY enthusiast, we therefore strongly recommend the fitting of a reconditioned exchange unit.
However, if you do intend to recondition your own unit, please contact us with the parts you require, and we may be able to supply them from stock.
The parts listed in this section are basically rebuild components only, we have not itemised all parts due to the lack of availability.
Important
All our Overdrive units are supplied on a strict 'like for like' exchange basis.
Your old exchange units must be undamaged and be in a totally serviceable condition.
All overdrives are supplied less solenoid, output flange, adaptor plate & speedo drive. Refer to listings for details.

Overdrive Unit
Reconditioned exchange overdrive units are supplied less solenoid, output flange, adaptor plate & speedo drive.
Overdrive Unit Only ('D' type) - (1) - 307862R
All models.

Gear Oil
Unipart EP90 (0.5 litre) - (ar) - GGL190

Adaptor Plate & Fittings




Bearing (front input) - (1) - 7H8301
Adaptor Plate (overdrive to gearbox) - (1) - 305137
Gasket Set ('D' type overdrive) - (1) - RG1048
Includes all necessary gaskets.

Gaskets;
Adaptor Plate to Gearbox - (1) - 106437
Main Case to Adaptor Plate - (1) - 37H1901
Filter Cover - (1) - 506098
Solenoid to Casing - (1) - 7H8196
Side Cover (solenoid side) - (1) - 513204
Main Case to Rear Case - (1) - 37H1901

Fasteners (main case to adaptor plate);
Stud - (8) - NKC57
Nut - (8) - GHF200
Washer (spring) - (7) - GHF331

The following parts are not illustrated

Fasteners (adaptor plate to gearbox);
Triumph used alternative fastening methods for locating the adaptor plate to the gearbox, it is down to personal choice.
Use either 7 setscrews, or 5 studs & 3 setscrews, or 7 studs.
Setscrew - (ar) - SH605071
Stud - (ar) - 132115
Stud - (ar) - GHF201
Washer (spring) - (7) - GHF332

Solenoid




Solenoid - (1) - 109521
Plunger Only (solenoid) - (1) - 109521PLUNGER
Nut - (1) - GHF271
Gasket (solenoid to case) - (1) - 7H8196
Screw - (2) - PX504
Washer - (2) - WF702101

Main & Rear Case Fittings




Bearing (front) - (1) - 7H8301
Gasket (main to rear case - (1) - 37H1901
Cone Clutch (sliding) - (1) - 513200R
Bearing - (1) - 134465
Locates on to front of annulus shaft.
Drive Gear (speedo drive) - (1) - 506099
Locates on mainshaft.
Spacer - (1) - 513211
Bearing (rear output) - (1) - 533360A
Locates on to rear of annulus shaft.
Oil Seal (rear casing/output) - (1) - 7H8325
Drive Flange - (1) - 146102
Washer - (1) - UKC8120
Nut (castle head) - (1) - 515817
Split Pin - (1) - PC12

The following parts are not illustrated

Fasteners (rear case to main case);
Stud - (6) - 506082
Stud - (2) - 506103
Nut - (8) - GHF200
Washer (spring) - (7) - GHF331

Speedo Drive & Cable




Speedometer Cable (overdrive models);
Mk1, Mk2 & Mk3 (RHD & LHD) - (1) - GSD113
MkIV -
RHD (to FH60000) - (1) - GSD273
LHD (to FM60000U) - (1) - 156318

Angle Drive - (1) - 120694
Speedo Drive Pinion - (1) - 506119
'O' Ring/Seal - (1) - 506115
Housing/Bearing - (1) - 506066
Speedo drive pinion.
Setscrew (speedo housing locking) - (1) - 506071
Washer - (1) - 500469
Gear (speedo drive) - (1) - 506099
Located on mainshaft.



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