Model	Gear ratio	Year	Serial number	Upper drive gear kit	Upper gear housing service kit
120 / 140	1.98	1970-1982	2791957-6225576	11240	N / A
470 / 485	1.84	1976-1982	4208730--6225575	11230	N / A
165	1.65	1970-1981	2763442 and up	11220	N / A
888	1.50	1971-1977	3106717 and up	11210/11212	N / A
225-S	1.50	1974	3856268-4200499	11210/11212	N / A
898/228	1.50	1977-1982	4782330-6225576	11210/11212	N / A
260	1.50	1978-1982	4898730-6225576	11210/11212	N / A
R/MR/Alpha One	1.98	1983-1990	6225577 and up	11240	11245
R/MR/Alpha One	1.84	1983-1990	6225577 and up	11230	11235
R/MR/Alpha One	1.65	1983-1990	6225577 and up	11220	11225
R/MR/Alpha One	1.50 HD	1983-1990	6225577 and up	11210/11212	11215
Alpha One SS	1.50	1986-1989	OA545004 and Up	11210/11212
Alpha One Gen ll	2.40	1991-1997	OD469859-OK999999	11240	11246
Alpha One Gen ll	1.98/1.94	1991-1997	OD469859-OK999999	11240	11246
Alpha One Gen ll	1.65/1.62	1991-1997	OD469859-OK999999	11220	11226
Alpha One Gen ll	1.84/1.81	1991-1997	OD469859-OK999999	11230	11236
Alpha One Gen ll	1.50/1.47	1991-1997	OD469859-OK999999	11210/11212	11216
Alpha One Gen ll	2.40/1.94	1998 & up	OL000040 and up	11244	11247
Alpha One Gen ll	1.81	1998 and up	OL000040 and up	11233	11237
Alpha One Gen ll	2.00/1.62	1998 and up	OL000040 and up	11222	11227
Alpha One Gen ll	1.47	1998 and up	OL000040 and up	11214	11217

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