Complete Upper Gear Case

Replaces: 1547-9412A21

Ratio: 1.65:1/1.62:1 (24/24)

Engine: 6 Cylinders inline

Replaces: Mercruiser: 74639, 74639A2, 74639B1, 74639Q02; Bombardier: 0508696, 0775542

Replaces: 1547-861063A6

For: Alpha Gen II (1991 & UP) for gear ratios 1.98:1 and 2.40:1, 1.94(20/24)

Engine: 3.0L/3.0LX

Replaces: 

# OD469859-OK999999, 1991-1997

Replaces: 1547-815930A7

Replaces: Mercruiser: 26-32511A1, 27-94996A3, 27-94996Q2, 27-94996T2, 64818A3, 94996A2, 94996A20, 94996BK2, 94996Q2; OMC/Johnson/Evinrude: 0508537, 0508539, 0508557, 0508577, 0775545 

Alpha One Gen OD469859-OK999999 (1991 - 97)

Replaces: 1547-9412A23

Ratio: 1.98/1.94 (20/24)

Engine: 4 Cylinders Inline

Replaces: 1547-861063A12

For: Alpha Gen II (1991 & UP) for gear ratios 1.47:1, 1.50:1.(20/22)

Engine: 5.0LEFI/5.7/350 MAG

Replaces: 1547-861063A4

For: Gen II Upper (1998-up), 0L100040-up, 1.47:1 Ratio/Gen II Upper (1998-up) 0L100040-up, 1.62/2.00:1 Ratio´s/Gen II Upper (1998-up), 0L100040-up, 1.81:1 Ratio/Gen II Upper (1998-up), 0L100040-up, 1.94/2.40:1 Ratios

Serial nr. OD469859 and up

Replaces: 1623-815822A7, 1623-815822A33, 1623-815822A47

Replaces: 1623-8951A27, 1623-8951A37

For: MR/ALPHA Style

Bore size 3.2635-3.2650. Includes tapered roller bearing for non-tractor 14/28 or 17/28 gears.

Replaces: Mercruiser: 12-815952, 815952

Engines: ALPHA ONE GEN II (1991+)

Replaces: 1623-5356A4

For: R Style

Replaces:

Mercruiser: 1547-9412A20, 5-5010147CP, 547-9412A20, 547-9412R20, 8265A15, 9412A30, 9412A35; Sierra: 18-2450

Engine: up 300 HP - most V8

Ratio: 1.47 (20/22)

Serial no. 6225577 & up

Replaces: 1623-8951A26, 1623-8951A33

Replaces: 1547-9412A22

Ratio: 1.84/1.81 (17/19)

Engine: V6 & 470/485