MERCRUISER
Drive System
MERCRUISER STERNDRIVE LOWER GEAR HOUSING BEARINGS
Prop
Sterndrive
Bearing
Lower Drive
Upper
Inside Forward
Outside
Reverse
Model
Years
Beg. S/N - End. S/N
Carrier
Shaft (Pinion)
Drive Shaft
Gear (Needle)
Forward Gear
Gear
60
1965-66
1830753 - 2063740
--
--
--
--
--
80/90
1966-72
2063741 - 3225967
--
--
--
I
1963
1534570 - 1536617
--
--
I
1963
1536618 - 1684187
--
--
--
IA,IB,IC
& EZ Shift
1964-66
1684188 - 2065189
--
--
120/140
1967-69
2062141 - 2791956
--
120/140
1970-77
2791957 - 4893634
--
120/140
1978-82
4893635 - 6225576
470
1976-77
4208730 - 4893934
--
470/485
1978-82
4893835 - 6225576
160
1967-69
2065190 - 2763441
--
165
1970-77
2763442 - 4890459
--
165
1978-81
4890460 - UP
888
1971-77
3106717 - UP
--
225/233
1974-77
3856268 - UP
--
898/228
1977
4782330 - 4898729
--
898/228
1978-82
4898730 - 6225576
250
1977
4791300 - 4898729
--
255-TRS
1973-74
3377316 - 4203749
--
--
--
N/A
260
1978-82
4898730 - 6225576
280-TRS
1975-76
4203750 - 4895399
--
--
--
N/A
R
1983
6225577 - UP
MR /
Alpha One
1984-90
6225577 - UP
--
MR /
Alpha One
1984-90
6225577 - UP
MR /
Alpha One
(CR)
1984-90
6225577 - UP
--
--
--
Alpha One
SS
1986-89
A545004 - UP
Alpha One
Gen II
1991-95
D469859 - F679999
Alpha One
Gen II (CR)
1991-95
D469859 - F679999
--
--
--
Alpha One
Gen II
1996-97
F680000 - K999999
Alpha One
Gen II (CR)
1996-97
F680000 - K999999
--
--
--
Alpha One
1998-
Gen II
newer
L100040 - UP
Alpha One
1998-
Gen II (CR)
newer
L100040 - UP
--
--
II
1962-67
1474909 - 2275488
--
--
--
N/A
N/A
II
1968-69
2398798 - 2671321
--
--
--
--
II-TR
1973-76
3377316 - 4794899
--
--
--
--
N/A
TR
1973-93
4794900 - UP
--
--
--
--
N/A
TRS
1973-93
4794900 - UP
--
--
--
N/A
(2) Torrington#B1616
➃ #15520 Stamped on Cup
(3) Prop Shaft Drive Gear
(5) Use 18-1173 for 2.40:1 ratio only (new style
lower gears) our 18-2206
705
