Gearbox internal ratios															Chains
	Gearbox	Année	Mainshaft				Layshaft
			4	3	2	1	4	3	2	1	3rd	2nd	1st			Primary
	Pre-unit standard	1938-49	25	23	19	15	19	21	25	29	1.201	1.731	2.544			Pre-unit 0.5 pitch x 0.335 roller diameter x 0.305 in. between inner plates
	Pre-unit wide	1938-49	27	23	18	15	17	21	26	29	1.452	2.294	3.071			Modèle	Année	Number of pitches
	Pre-unit close	1947-49	24	23	20	18	20	21	24	26	1.096	1.440	1.733			3T	1946-51	74
	Pre-unit standard	1950-62	26	24	20	16	20	22	26	30	1.192	1.690	2.417			5T	1938-54	78
	Pre-unit wide	1950-62	28	24	19	16	18	22	27	30	1.426	2.211	2.917			T100	1939-53	78
	Pre-unit close	1950-62	24	23	21	18	22	23	25	28	1.091	1.299	1.697				1954	70
	Small unit standard	1957-63	26		23			23		32	1.180	1.750	2.450			TR5	1949-54	76
	Small unit standard	1963-72	22	24	21	16	15	20	23	27	1.222	1.606	2.475			6T	1950-54	80
	Small unit wide	1967-72	23	24	20	15	14	20	24	29	1.369	1.971	3.176			T110	1954	70
	Small unit close	1967-72	20	22	20	16	17	21	23	27	1.123	1.353	1.985			5T s/c	1938-54	77
	TR5T	1973-74	22	24	20	15	15	20	24	29	1.222	1.760	2.835			T100 s/c	1939-53	77
	Unit 650 standard	1963-69	26	24	20	16	20	22	26	30	1.192	1.690	2.437			6T s/c	1950-54	78
	Unit 650 wide	1966-72	28	24	19	16	18	22	27	30	1.426	2.210	2.917			ALL	1955-62	70
	Unit 650 close	1966-72	24	23	21	18	22	23	25	28	1.091	1.299	1.697			(5T, 6T, TR5, TR6, T100, T110, T120)
	Unit 650 standard	1970-72	26	23	20	16	20	22	26	30	1.243	1.690	2.437
	5 speed gearbox	1972	1, 1.19, 1.40, 1.837, 2.585													Unit 0.375 x 0.250 x 0.225 in. Duplex, 350 and 500 - 78 links, 650 - 84 links
	Sprockets, boxes and overall gear ratios															Final drive   0.625 x 0.400 x 0.380 in.
																Modèle	Année	Number of pitches
	Modèle	Année	Sprockets				Overall ratio				Box Type					3T	1946-51	90
	pre-unit		E	C	G	R					to 1949		from 1950			5T	1938	92
	3T	1946-51	19	43	18	46		5.784			1		4				1939-51	93
	5T	1938-58	22	43	18	46		4.995			1		4				1952-54	92
	5T s/c	1938	20	43	18	46		5.494			1					T100	1939-51	93
		1939-58	19	43	18	46		5.784			1		4				1952-53	92
	T100	1939-59	22	43	18	46		4.995			1		4				1954-59	100
	T100 s/c	1939-58	19	43	18	46		5.784			1		4			TR5	1949-54	90
	T100c	1953	22	43	18	46		4.995					4 or 6				1955-58	100
	T100c s/c	1953	19	43	18	46		5.784					4 or 6			6T	1950-51	93
	TR5	1949-54	21	43	18	46		5.233			2		5				1952-54	92
		1955-58	21	43	18	46		5.233					4				1955-59	101
	6T	1950-59	24	43	18	46		4.579					4				1960-61	99
		1960	23	43	18	43		4.466					4				1962	98
		1961-62	22	43	18	43		4.669					4			T110	1954-59	101
	6T s/c	1950-58	21	43	18	46		5.233					4				1960-61	99
		1959	22	43	18	46		4.995					4			TR6	1956-59	101
		1960	20	43	18	43		5.136					4				1960-61	99
	T110	1954-59	24	43	18	46		4.579					4				1962	98
		1960	23	43	18	43		4.466					4			T120	1959	101
		1961	22	43	18	43		4.669					4				1960-61	99
	T110 s/c	1954-58	21	43	18	46		5.233					4				1962	98
		1960	20	43	18	43		5.136					4			3TA	1957-63	100
	TR6	1956-59	24	43	18	46		4.579					4				1964	103
		1960	22	43	18	43		4.669					4				1965-66	102
		1961-62	21	43	18	43		4.891					4			T90	1963-69	102
	TR6 s/c	1956-58	21	43	18	46		5.233					4			5TA	1959-63	101
	T120	1959	24	43	18	46		4.579					4				1964	103
		1960	22	43	18	43		4.669					4				1965	104
		1961-62	21	43	18	43		4.891					4				1966	103
	Option engine sprockets 17 to 24T to 1949,															T100A	1960-61	101
	17 to 25T from 1950 in two types, 1950 to 1952 and 1953 to 1962.															T100SS	1961-63	101
																	1964-65	102
	Modèle	Année	Sprocket				Overall ratio				Gearbox					T100	1966	102
	Unit		E	C	G	R										T100C	1966-72	102
	3TA	1957-63	26	58	18	43		5.329			7					T100R	1966	102
		1964	26	58	19	46		5.401			8						1967	103
		1965	26	58	18	46		5.701			8						1968-72	102
		1966	26	58	17	46		6.036			8					T100S	1967-70	102
	T90	1963-69	26	58	17	46		6.036			8					T100T	1967-70	102
	5TA	1959-60	26	58	20	43		4.796			7					6T	1963-65	103
		1961-63	26	58	19	43		5.048			7						1966	102
		1964-65	26	58	20	46		5.131			8					TR6	1963-65	103
		1966	26	58	19	46		5.401			8						1968-70	104
	T100A	1960	26	58	20	43		4.796			7					TR6C	1966	102
		1961	26	58	19	43		5.048			7						1967	104
	T100SS	1961-62	26	58	18	43		5.329			7						1971-72	106
		1963-65	26	58	18	46		5.701			8					TR6R	1966	103
	T100	1966	26	58	18	46		5.701			8						1967	104
	T100C	1966-72	26	58	18	46		5.701			8						1971-72	106
	T100R	1966-67	26	58	19	46		5.401			8					T120	1963-65	103
		1968-72	26	58	18	46		5.701			8						1968-70	104
	T100S	1967-70	26	58	18	46		5.701			8					T120R	1966	103
	T100T	1967-70	26	58	18	46		5.701			8						1967	104
	Option gearbox sprockets 17 to 20 teeth																1971-72	106
																T120TT	1966	102
	Modèle	Année	Sprockets				Overall ratio				Box Type						1967	103
	Unit 650		E	C	G	R					to 1969		from 1970
	6T	1963-66	29	58	20	46		4.600			12
	6T s/c	1963-66	29	58	18	46		5.111			12
	6T (USA)	1966	29	58	18	46		5.111			12
	TR6	1963-70	29	58	19	46		4.842			12		15
	TR6 s/c	1963-65	29	58	17	46		5.412			12
		1969-70	29	58	17	46		5.412			12		15
	TR6C (east)	1966	29	58	18	46		5.111			12
	TR6C (west)	1966	29	58	17	46		5.412			12
	TR6R	1966-67	29	58	19	46		4.842			12
		1971-72	29	58	19	47		4.947					15
	TR6C	1967	29	58	18	46		5.111			12
		1971-72	29	58	18	47		5.222					15
	TR6RV	1972	29	58	19	47		4.947					16
	TR6CV	1972	29	58	19	47		4.947					16
	T120	1963-70	29	58	19	46		4.842			12		15
	T120 s/c	1963-65	29	58	17	46		5.412			12
		1969-70	29	58	17	46		5.412			12		15
	T120R	1966-67	29	58	19	46		4.842			12
		1971-72	29	58	19	47		4.947					15
	T120TT	1966-67	29	58	17	46		5.412			12
	T120RV	1972	29	58	19	47		4.947					16
	Option gearbox sprocketts 15 to 20 teeth