Mercruiser Alpha One gear set *upper-lower unit

Gear sets with bearing and sliding clutch dogs

Last updated on 12/08/2023, 01:17:46

  • Mercruiser Alpha One Gen 1 and Generation 2 lower unit upper gear set, forward shim set
  • Heavy duty upper gears, for 4 cylinder, v6 and v8 stern drive models
  • Reverse gear only
  • Exploded view Mercruiser drawings
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Upper gearcase

V8 43-18410A4 11210 18-2201

P/N 11210 – V8 gear set replaces 43-18411A2 and Sierra 18-2201

Includes driven bearing 31-32573A1
1.50 ratio
20/22 pinion and driven gear tooth count
Serial numbers 3106717 to 0K999999
Years 1970 to 1997.
$399.99

Gear set outdrive 1998 up 43-853641A2 11214 18-6351

P/N 11214 – V8 set – replaces 43-853641A2, Sierra 18-6351 $330.99
(Includes driven bearing #31-32573A1) 1.47 ratio 20/22
(serial numbers 0L000040 and up) years 1998 and up.

1.98-1.94 4 cylinder 20-24 43-55778A3 11240

P/N 11240 – 4 cylinder set replaces 43-5578A3 $332.99
1.98 or 1.94 ratio 20/24 (serial number 2791957 – 0K999999) years 1970 – 1997

11244 Alpha 1 Gen 2 Gear set - 1:94 to 2.4 upper 4 cylinder 43-853642A2 11244 18-6352

P/N 11244 – 4 cylinder gears – replaces 43-853621A2, Sierra 18-6352 $359.95
1.94 or 2.4 ratio 20/24 (serial numbers 0L000040 and up) 1998 and up.

1.84 / 1.81 V6 470-485 43-75325A3 11230

P/N 11230 – V6 set – replaces 43-75325A3 $337.99
1.84 or 1.81 ratio 17/19 (serial number 4208730 – 0K999999) years 1976 – 1997

1.81 17-19 V6 43-853643A2 11233 18-6353

P/N 11233 – V6 set – replaces 43-853643A2, Sierra 18-6353 $299.99
1.47 ratio 20/22 (serial numbers 0L000040 and up) years 1998 and up.

1.65 / 1.62 inline 6 43-45814A5 11220

P/N 11220 – Inline 6 cylinder set – replaces 43-45814A5 $275.99
1.65 or 1.62 ratio 24/24 (serial number 2766442 – 0K999999) years 1970 – 1997.

1.62-2.0 24/24 6 cylinder 43-853640A2 11222 18-6350

P/N 11222 – Inline 6 cylinder set – replaces 43-853640A2, Sierra 18-6350 $320.99
1.62 or 2.0 ratio 24/24 (serial numbers 0L000040 and up) years 1998 and up.

Lower unit gearcase

Clutch dog lower unit 52-853594T 11060

P/N 11060 – Clutch dog – replaces 52-853594T $199.99
Compatible with all lower units – Mercruiser / Alpha 1 / Gen 2 (1972 and up) (except 2.40 ratio, Bravo and TRS models)

Forward pinion 43-828072A2 11091

P/N 11091 – Lower unit pinion / forward gear with forward bearing OEM 31-35928T1 $417.99

13/21 ratio (serial numbers 6225577 and up) – compatible with all 1984 years and up models except 2.40 ratio, Bravo and TRS models

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12120

P/N 12120 Lower gear case water pump impeller kit rebuild kit, with housing. Compatible with 1984-1990 models. Replaces Sierra 18-3320. $42.99

21450

P/N 21450 Lower unit shift cable. Compatible with all models 1972 and up. Note, this cable installs from the AFT end of the bell housing, some minor modifications may be required on older model housings. Replaces Mercury part number 865436A03 and Sierra kit 18-2603. $89.99

Kit includes:
P/N 21710 Shift Cable 41951A1
P/N 21750 Set Screw 10-45590
P/N 21790 Bellow Clip 54-38863
P/N 21791 Hose Clamp 54-85504320
P/N 39622 Gasket Kit 27-94996A2
P/N 89080 74639 Bellow
P/N 21085 Slide w/ Screw 850752-1
P/N 21140 Shift Arm 45518A2
P/N 21430 Guide 43433
P/N 21432 Anchor 43436
P/N 21433 Set Screw 10-20518
P/N 21462 Wrapping 38473
P/N 21463 Insert 14705

12043

P/N 12043 Alpha generation 2 impeller water pump kit $44.99

Parts included:

P/N 89630 Impeller
P/N 12824 Coupling assembly
P/N 12500 Wear plate
P/N 31240 Gasket
P/N 30090  Gasket
P/N 82110 O Ring Seal

21960

P/N 21960 Sterndrive Generation 2 bellows kit with sealed gimbal bearing,oil seal and bellows gasket. Drive shaft bellows includes internal aluminum sleeve. For 1991 and up models only. Replaces Mercury part number 30-803099T1 $169.99

21950

P/N 21950 Sterndrive exhaust bellows kit Years 1973 thru 1990 with serial numbers 3469428 to 0D469800. OEM part number 30-803097T1 $145.95

Includes:

P/N 21906 Gimbal bearing
P/N 85910 oil seal
P/N 89080 shift cable bellow
P/N 89100 exhaust bellow
P/N 39622 bell housing gasket
P/N 47110/47120 water hoses
P/N 89050 drive shaft bellow

87510

P/N 87510 Mercruiser and Alpha 1 Gen 1 lower unit seal and gasket kit, replaces Mercury 26-33144A2 for years 1964 to 1990 Serial numbers 1684188 – OD469858. $44.99

Included in kit:

Oil seals
Gaskets
O-rings