OVERDRIVE 'A' AND 'J'-TYPE

CAR IDENTIFICATION

When ordering parts, it is essential that you identify your car exactly, by model year and serial number. Since many part changes were made during model years, the commission number, engine number and body number provide the only positive identification. Quite often a car's title will not show the correct model year. Before ordering parts, please record the applicable numbers from your car. Using these numbers is the best way to ensure that you order and receive the correct parts. Wherever possible, we have listed part applications by commission number (e), body number (b) or gearbox (g). For more information on these numbers and years, see the production data below.

Year	Model	Numbers manufactured
		From	To
1953	TR2	TS1 (Aug)	TS302
1954		TS303	TS5192
1955		TS8637 (Sept)	TS9665
1955	TR3	TS8637 (Sept)	TS9665
1956		TS9666	TS14998
1957		TS14999	TS22013 (Sept)
1957	TR3A	TS22014 (Sept)	TS25632
1958		TS25633	TS41629
1959		TS41630	TS65123
1960		TS65124	TS82029
1961		TS82030	TS82346 (Oct)
1961	TR4	CT1 (Aug)	CT2470 (approx.)
	TR3B*	TSF1 (Mar)	TSF530 (Sept)
1962	TR3B*	TCF1	TCF2804 (Oct)
1962	TR4	CT2471 (approx.)	CT18403 (approx.)
1963		CT18404 (approx.)	CT28485 (approx.)
1964		CT28486 (approx.)	CT40000 (approx.)
1965		CT40001 (approx.)	CT40304 (approx.)
1965	TR4A	CTC50001	CTC63736 (approx.)
1966		CTC63737 (approx.)	CTC75000 (approx.)
		CTC75001 (approx.)	CTC78684 (approx.)

*A Note on TR3B's

The TR3B was a very interesting and rare car. Declining sales in the late 50's and early 60's of the TR3 series had led Triumph to carry out a major re-design of the car, which became known as the TR4. It was based on the TR3 running gear but had a Michelotti designed body with wind-up windows and other features designed to improve comfort. The reaction to the TR4 in America was, initially, less than favourable and there was a minor panic back in Coventry where the feeling existed that a mistake had been made in introducing the TR4, and, it was felt essential that the TR3 was 're-introduced'. The car that was re-introduced was the TR3B and in its most basic form the same as the TR3A. There were two series of commission numbers (TSF and TCF), we believe the TSF series was for the 1991cc (83mm) engine and the TCF series for the 2138cc (86mm) engine. Both vehicles were fitted with the later TR4 all-synchromesh gearbox. These are the only distinguishing features that all experts appear to agree on. Unless otherwise specified in the text, all details of the TR3B can be considered to be the same as the post T60001 TR3A.

Location of Serial Numbers

TR2-3B Commission Number

This number is stamped on a plate which is riveted to the righthand bulkhead panel.

TR4-4A Commission Number

This number is stamped on a plate which is riveted to the lefthand bulkhead panel.

TR2-4A Gearbox Number

This number is stamped on the lefthand side of the gearbox casing.

TR2-4A Engine Number

The engine number is stamped on the lefthand side of the cylinder block.

Supersession of Parts

For those of you in possession of original Triumph parts books you may have information which conflicts with that given in the original book. This is usually because the part has been 'superseded' because of some change in specification. For example XKC510 is the lefthand A-post. It used to be 813100 (and the righthand is still 813101), but when the TR6 USA specification cars had an audible buzzer fitted to advise owners that they had opened their door and left the keys in the ignition, it required an extra hole in the A-post to sense the door being opened. Hence 813100 with one hole for a courtesy light becomes XKC510 with two holes. There are many other examples where our Research & Development Department staff find old Austin/Morris saloon car parts that 'will do' to replace 'no longer available' TR parts. These often utilise different part numbers to those shown in the original Triumph parts book.

Model	COMMISSION No.	CHANGES
TR2	TS1	TR2 introduced.
	TS1307	MGA, Frogeye, London Taxi type stop/tail lamps introduced.
	TS4002	Outer sills and 'short door' fitted.
	TS4239	Dzus fasteners replace cables to open bonnet.
	TS6157	Vent lid introduced.
TR3	TS8637	TR3 introduced, 'egg-box' grille fitted.
	TS12568	Windscreen wiper motor moved from righthand to the lefthand side of bulkhead.
	TS13046	Girling hydraulics introduced. TR3 becomes the first mass produced car with disc Brakes fitted as standard.
TR3A	TS22014	Window grille, exterior door handles, different front bumper & overrider design.
	TS28826	Dzus fasteners used on sidescreens.
	TS41878	Colour scheme of front badge changes from red and black to blue and white.
	TS50001	Starter motor changed.
	TS60001	Major body re-design. 'Raised' hinge mounting points, squared rear floor. One piece boot floor fitted. Windscreen stanchions held on by screws in place of Dzus fasteners.
	TS83572	Last TR3A
TR3B	TSF1	TR3B introduced with 1991cc engine and 4 synchro' gearbox.
	TCF1	TR3B introduced with 2138cc engine and 4 synchro' gearbox.
	TCF2804	Last TR3B
TR4	CT1	First TR4 introduced.
	CT6636	Re-designed front suspension with 3* castor.
	CT16801	Stromberg carburettors introduced as mixed fitment.
	CT23383	Deep dish rear springs introduced.
	CT40304	Last TR4 produced.
TR4A	CTC50001	Introduction of the first IRS TR4A, (Solid axle TR4A's Were prefixed 'CT' beginning at CT50001)
	CTC61291	Stromberg carburettors replaced by HS6 SU's.
	CT70000 (approx.)	Cross box silencer introduced
	CT787684	Last of the TR4A rolled of the production line (10th July 1967).

unillustrated articles

Ill.no.	Partno.	Part	Quantity required	Price
NI	120694	ANGLE DRIVE, SPEEDOMETER	1	CHF 98.55
NI	3H550	COPPER WASHER 7/16X0.7	1	CHF 1.75
NI	NKC48	PINION SPEEDO DRIVE TR6 OVERDRIVE	1	CHF 64.65
NI	NKC42	SPEEDO BEARING	1	CHF 69.80
NI	NKC106	O Ring Overdrive J-Type	1	CHF 3.85
NI	NKC105A	OIL SEAL SPEEDODRIVE	1	CHF 18.25
NI	NKC43	RETAINER, PINION	1	CHF 32.90
NI	SH604051	SCREW 1/4" UNF X 5/8"	1	CHF 0.95
NI	WE600041	WASHER, SHAKEPROOF, 1/4"	1	CHF 1.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
1	517198	OVERDRIVE CONVERSION KIT TR5/6 RHS	1	RHD	availability request
1	517197	OVERDRIVE CONVERSION KIT LHS TR5/6	1	LHD	availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
41	521158	O/D CONVERSION KIT RHS TR6-J	1	RHD	availability request
41	521159	O/D CONVERSION KIT LHS TR6 J-TYPE	1	LHD	availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
78	713569FG	GEARBOX COVER FIBERGLASS	1		CHF 188.60

Ill.no.	Partno.	Part	Quantity required	Info	Price
85	211361X	BRACKET+FITTING KID OVERDRIVE CONVERSION J- TO A-TYPE	1		CHF 205.70

Ill.no.	Partno.	Part	Quantity required	Info	Price
88	104086ADP	PLATE KIT ADAPTS 2000 OD TO FIT TR2-6	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
'A'Type Overdrive Conversion
1	517198	OVERDRIVE CONVERSION KIT TR5/6 RHS	1	RHD	availability request
1	517197	OVERDRIVE CONVERSION KIT LHS TR5/6	1	LHD	availability request
'J' Type Overdrive Conversion
41	521158	O/D CONVERSION KIT RHS TR6-J	1	RHD	availability request
41	521159	O/D CONVERSION KIT LHS TR6 J-TYPE	1	LHD	availability request
Overdrive and Gearbox Cover
78	713569FG	GEARBOX COVER FIBERGLASS	1		CHF 188.60
NI	120694	ANGLE DRIVE, SPEEDOMETER	1		CHF 98.55
NI	3H550	COPPER WASHER 7/16X0.7	1		CHF 1.75
NI	NKC48	PINION SPEEDO DRIVE TR6 OVERDRIVE	1		CHF 64.65
NI	NKC42	SPEEDO BEARING	1		CHF 69.80
NI	NKC106	O Ring Overdrive J-Type	1		CHF 3.85
NI	NKC105A	OIL SEAL SPEEDODRIVE	1		CHF 18.25
NI	NKC43	RETAINER, PINION	1		CHF 32.90
NI	SH604051	SCREW 1/4" UNF X 5/8"	1		CHF 0.95
NI	WE600041	WASHER, SHAKEPROOF, 1/4"	1		CHF 1.65
Halterungen/Aufhängungen Overdrive-Umbau
85	211361X	BRACKET+FITTING KID OVERDRIVE CONVERSION J- TO A-TYPE	1		CHF 205.70
88	104086ADP	PLATE KIT ADAPTS 2000 OD TO FIT TR2-6	1		availability request

OVERDRIVE 'A' AND 'J'-TYPE

'A'Type Overdrive Conversion

'J' Type Overdrive Conversion

Overdrive and Gearbox Cover

Halterungen/Aufhängungen Overdrive-Umbau