Page 863 - 2021 Sierra Catalog

845
18-2415
GEAR HOUSING ASSEMBLY
Replaces: 1623-815822A36
For: Ratios 1.47, 1.62
Gen II (1998 & up), (0L100040 & up)
Used with: 18-2400 Complete Lower Gear Case
18-2416
COMPLETE UPPER GEAR CASE
Replaces: 1547-815930A16, 1547-815930A6, 1547-861063A12 For: Alpha Gen II (1991 & UP) for gear ratios 1.47:1, 1.50:1
Used with 18-2411 Drive Shaft Housing Assembly
18-2419
COMPLETE UPPER GEAR CASE
Replaces: 1547-815930A13, 1547-815930A3, 1547-861063A6 For: Alpha Gen II (1991 & UP) for gear ratios 1.98:1, 2.40:1
Used with 18-2411 Drive Shaft Housing Assembly
18-2450
COMPLETE UPPER GEAR CASE
Replaces: 1547-9412A20, 1547-3917A13, 1547-3917A21, 1547- 3917A32, 1547-3917A37, 1547-5523A2, 1547-5523A9, 1547-5523A12, 1547-5523A68, 1547-8265A15, 1547-9412A30, 1547-9412A35
For: Alpha I 1.5:1/1.47:1
18-2451
COMPLETE
UPPER GEAR CASE
Replaces: 1547-9412A21, 1547-3917A4, 1547-3917A8, 1547-3917A16, 1547-3917A30, 1547-3917A38,
1547-5523A8, 1547-5523A11, 1547-8265A16 For: Alpha I
1.65:1/1.62:1
18-2452
COMPLETE
UPPER GEAR CASE
Replaces: 1547-9412A22, 1547-5523A67, 1547-8265A17,
1547-9412A36 For: Alpha I 1.84:1/1.81:1
18-2453
COMPLETE
UPPER GEAR CASE
Replaces: 1547-9412A23, 1547-5523A49, 1547-5523A67, 1547-8265A17 For: Alpha I
1.98:1/1.94:1
18-2443
COMPLETE
LOWER GEAR CASE Replaces: 1623-8951A43, 1623-4110A4, 1623-4110A6, 1623-4110A13, 1623-5356A3, 1623-5356A18, 1623-5356A19, 1623-5356A20, 1623-8951A2, 1623-8951A14, 1623-8951A19, 1623-8951A23
For: R/MR/ALPHA 1
18-2401
LOWER GEAR HOUSING Replaces: 1623-8951A27,
1623-8951A37, 1623-8951A5, 1623-8951A15
For: MR/ALPHA Style
Bore size 3.2635-3.2650. Includes tapered roller bearing for non-tractor 14/28 or 17/28 gears. When installing new gears use 18-2206-1 gear kit which includes tapered roller bearing 18-1156 for tractor 13/21 gears.
18-2402
LOWER GEAR HOUSING
Replaces: 1623-5356A4 For: R Style
I/O — MERCRUISER - Drive System