Mercruiser gear set * Upper/Lower unit gearcase

Outdrive forward, pinion, reverse, upper gears for all models including MC-1 / R / MR and Mercruiser Alpha One Gen One and Generation 2
Compatible with 120/140 4 cylinder, inline 6 cylinder, V6 and 5.0-5.7 liter V8 motors
Stern drive upper and lower unit gear sets with bearings and shims
Ratios, years and serial numbers
See our application chart for lower units and upper units for help with choosing the right one for your model Limited selection of used gears also available
Tech support Exploded view drawings

11210 Mercruiser

upper housing

P/N 11210 Heavy duty gear set
20/22 #43-18411A2 $430.89
Includes P/N 21560 Driven roller bearing #31-32573A1

Upper gears compatible with all V8 outdrives
(1971 - 1990) and Alpha One gen ii models 1991-1997. 1.50 or 1.47 ratio
Serial numbers 3106717 - 0K999999

11215 OEM 43-803116T1

Complete Rebuild Kits
Click on picture for included items and for model / motor compatibility

P/N 11215
Ratio 20/22 (1.50/1.47) OEM 43-803116T1
Years 1971 - 1990
Serial numbers 3106717 - 0D4690000
$532.95

Kit contains
11210 Upper gear set 43-18411A2
87500 Seal Kit 26-32511A1
39590 Gasket Kit 27-64818T4
21560 Bearing 31-32573A1
21520 Bearing 31-35988A2
21510 Bearing 31-61100A1
23260 Shim 15-45691Al
23270 Shim 15-36178A1
23280 Shim 15-35980A1

11214

P/N 11214 1.47 20/22 ratio drive shaft housing upper gear set #43-853641A2 $330.99
Includes P/N 21560 Bearing #31-32573A1 Compatible with Alpha 1 Gen 2 (1998 and up)
Serial numbers 0L000040 - up

11240 1.98 ratio 4 cylinder OEM 43-55778A3

P/N 11240 1.98 or 1.94 overall 20/24 ratio gear set #43-55778A3 $332.99
Compatible with all 4 cylinder sterndrive models (1970 and up)
Serial numbers 2791957 - 0K999999

11244

P/N 11244 1.94 & 2.4 ratio 20/24 #43-853642A2 $360.99
Compatible with Alpha 1 Gen 2 (1998 and up) Serial numbers 0L000040 - up

11230

P/N 11230 1.84 or 1.81 overall 17/19 ratio outdrive upper housing
#43-75325A3 $337.99
Upper gears compatible with all V6 and 470/485 models (1976 - 1997)
Serial numbers 4208730 - 0K999999

11233

P/N 11233 1.81 ratio upper gear set 17/19 #43-853643A2 $299.99
Compatible with Alpha One Generation 2 outdrive (1998 and up) Serial numbers 0L000040 - up

11220 1.65 ratio 6 cylinder

P/N 11220 1.65 or 1.62 ratio upper gears 24/24 #43-45814A5 $275.99
Compatible with all inline 6 cylinder engines years 1970 to 1997 serial numbers 2763442 - 0K999999

11225 Gear ratio 24-24

P/N 11225
OEM 43-803112T1 Ratio 24/24 (1.65/1.62) OEM 43-803112T1
(1970 - 1990)
Serial numbers 2763442 - 0D4690000
$536.99
Kit contains
11220 Upper Gear Set 43-45814A5
87500 Seal Kit 26-32511A1
39590 Gasket Kit 27-64818T4
21560 Bearing 31-32573A1
21520 Bearing 31-35988A2
21510 Bearing 31-61100A1
23260 Shim 15-45691Al
23270 Shim 15-36178A1
23280 Shim 15-35980A1

11222

P/N 11222 1.62 & 2.0 ratio upper gear set 24/24 #43-853640A2 $320.89
Works with all Alpha 1 Gen ii models (1998 and up) Serial numbers 0L000040 - up

11235 Mercruiser ratio 17-19 years 1976-1990

P/N 11235
Ratio 17/19 (1.84/1.81) OEM 43-80311411
(1976 - 1990)
Serial numbers 4208730 - 0D4690000
$499.99

Kit contains
11230 Gear Set 43-75325A3
87500 Seal Kit 26-32511Al
39590 Gasket Kit 27-6481814
21520 Bearing 31-35988A2
21540 Bearing 31-35990A1
21510 Bearing 31-61100A1
23260 Shim 15-45691A1
23270 Shim 15-36178A1
23280 Shim 15-35980A1

11245 Mercruiser Gearcase Housing Rebuild Kit

P/N 11245
Ratio 20/24 (1.98/1.94) OEM 43-803101T1
(1970 - 1990)
serial numbers 2791957 - 0D4690000
$599.95

Kit contains

11240 Upper Gear Set 43-55778A3
87500 Seal Kit 26-32511A1
39590 Gasket Kit 27-64818T4
21520 Bearing 31-35988A2
21540 Bearing 31-35990A1
21510 Bearing 3161100A1
23260 Shim 15-45691A1
23270 Shim 15-36178A1
23280 Shim 15-35980A1

11247 Teeth 20-24 ratio 2.4 or 1.94 years 1998 and up

P/N 11247
Ratio 20/24 (2.4/1.94) OEM 43-803106T1
Years 1998 and up
$430.99
Kit contains
11244 Gear Set 43-853642A2
21511 Bearing 31-3257511
21522 Bearing 31-30894A5
21540 Bearing 31-35990A1
23261 Shim 15-32563A1
23270 Shim 15-36178A1
23280 Shim 15-35980A1
39622 Gasket Kit 27-9499612
87501 Seal Kit 26-88397A1

11236

P/N 11236
Ratio 17/19 (1.84/1.81) OEM 43-803120T1
Years 1991-1997
$525.99

Kit contains:
11230 Gear Set 43-75325A2
21510 Bearing 31-61100A1
21511 Bearing 31-32575T1
21520 Bearing 31-35988A2
21540 Bearing 31 -35990A1
23260 Shim 15-45691A1
23261 Shim1 15-32563A1
23270 Shim 15-36178A1
23280 Shim 15-35980A1
39622 Gasket Kit 27-9499612
87501 Seal Kit 26-88397A1

11100 Compatible with all 4 cylinder

lower unit

P/N 11100 Pinion and forward sterndrive gears OEM 43-96084A7 $264.99
Compatible with all 4 cylinder, 6 cylinder and V8 Mercruiser MC-1/R models years 1972 to 1983 serial numbers 3469428 - 6225576. 28 tooth forward / 17 tooth pinion gear

Outdrive model number, year and serial number

120 / 140 ratio 1.98

years 1972 to 1982 #3469428-6225576

470 / 485 ratio 1.84
years 1976 to 1982 #4208730-6225575

160 Note N/A will not fit

165 ratio 1.65 years
1972 to 1981 #3469428 and up

888 ratio 1.50
years 1971 to 1977 #3106717 and up

225 / 233 ratio 1.50-1.32
years 1974 to 1977 #3856268 and up

898 / 228 ratio 1.65-1.50
years 1977 to 1982 #4782330-6225578

250 / 260 ratio 1.5-132
years 1977 to 1982 #4791300-6225576

Type R all ratios year 1983 only #6225577 and up

11100 Compatible with all 4 cylinder

OEM Quicksilver / Merc 43-92158A1 $99.95

120 / 140 ratio 1.98

years 1972 to 1982

470 / 485 ratio 1.84
years 1976 to 1982

*Note - this is a discontinued original Quicksilver/Mercury forward gear with 33 teeth. Most models have a 28 tooth forward gear.

11091 MR Alpha 1 1984 up

P/N 11091 Pinion and forward set - 13:21 gear ratio $417.99
Can be installed on all MR/Alpha One and Generation 2 outdrives years 1984 and up. (except 2.40 ratio)

Includes P/N 21590 tapered roller bearing #31-35928T1

The forward gear has a retaining ring installed to prevent the needle bearing moving to the rear serial numbers 6225577 - up

11300

P/N 11300 Complete set #43-96084A4 $199.99 Includes pinion, reverse and forward gears compatible with all sterndrive models

years 1972 to 1983 serial numbers 3469428 - 6225576

11020 Reverse

P/N 11020 Reverse gear OEM 43-92320T $267.99 Works with all MC-1/R models

years 1972 to 1983 serial numbers 3469428 - 6225576

11060 clutch dog

P/N 11060 Clutch dog #52-853594T $199.99
This is the standard clutch dog that can be installed in all

MC-1 / R / MR / Alpha One and Generation 2 models, all ratios
1972 and up serial numbers 3469428 - up

Quicksilver clutch dog

6 jaw Mercury / Quicksilver clutch dog for early 1970's models, OEM 52-66063 $99.95

*Used with 33 tooth forward gear Mercury 43-92158A1 or 33 tooth reverse gear.

11312

P/N 11312 Complete gear set OEM 43-878087A4 $599.95 This kit includes the forward/reverse/pinion gears with bearings, shims and pinion nut.

Compatible with all MR / Alpha 1 / Gen 2 models from 1984 and up serial numbers 6225577 and up

25115 MC 1 and R seals bearings shims water pump gasket kit

P/N 25115 Complete lower unit Mercruiser rebuild kit OEM 43-803079T1 $484.99
This kit includes the forward, pinion, reverse gear with clutch dog.

All so included in kit are bearings, seals, shims and pinion nut.

Compatible with all MC-1/R models for years 1972 - 1983 Serial numbers 3469428 - 6225576

11013

P/N 11013 Reverse may require thrust spacer P/N 11012 please see our application chart.

11212

P/N 11212 Heavy duty gear set
OEM 43-18411A4
Ratio 20/22 (1.50/1.47) OEM 43-18411A4
Years 1970-1997

11226 Gear ratio 24-24

P/N 11226
Ratio 24/24 (1.65/1.62) OEM 43-803119T1

Kit contains:
11220 Gear Set 43-45814A5
21510 Bearing 31-61100A1
21511 Bearing 31-32575T1
21520 Bearing 31-35988A2
21540 Bearing 31 -35990A1
23260 Shim 15-45691 Al
23270 Shim 15-36178A1
23280 Shim 15-35980A1
39622 Gasket Kit 27-9499612
87501 Seal Kit 26-88397A1

11216 Gearcase service kit

P/N 11216
Ratio 20/22 (1.50/1.47)OEM 43-803102T1

Kit contains
11210 Gear Set 43-18411A2
21510 Bearing 31-61100A1
21511 Bearing 31-32575T1
21520 Bearing 31-35988A2
23260 Shim 15-45691A1
23261 Shim 15-32563A1
23270 Shim 15-36178A1
23280 Shim 15-35980A1
39622 Gasket Kit 27-94996T2
87501 Seal Kit 26-88397A1

11217 Gear ratio 20-22

P/N 11217
Ratio 20/22 (1.47) OEM 43-803103T1

Kit contains:
11213 Gear Set
21511 Bearing 31-32575T1
21522 Bearing 31-30894A5
21560 Bearing 31-32573A1
23261 15-32563A1 Shim1 5-32563A1
23270 15-36178A1 Shim 15-36178A1
23280 Shim 15-35980A1
39622 Gasket Kit 27-9499612
87501 Seal Kit 26-88397A1

11246 Gear ratio 20-24

P/N 11246
Ratio 20/24 (1.98/1.94) OEM 43-803118T1

Kit contains
11240 Gear Set 43-55778A3
21510 Bearing 31-61100A1
21511 Bearing 31-3257511
21520 Bearing 31-35988A2
21540 Bearing 31 -35990A1
23260 Shim 15-45691 Al
23261 Shim 15-32563A1
23270 Shim 15-36178A1
23280 Shim 15-35980A1
39622 Gasket Kit 27-94996T2
87501 Seal Kit 26-88397A1

Customers who purchased gears also looked at:

Prop Shaft Bearing Part 31-30956

Propeller shaft carrier bearing 11410 may be replaced when re-installing the carrier if the old part was damaged during removal. Replaces OEM 31-30956T, Sierra 18-1158.

87510 Seal Kit 26-33144A2

Lower unit seal kit 87510 is required when re-assembling the parts in the bottom end. Replaces OEM 26-33144A2, Sierra 18-2652.

12120 Impeller kit

P/N 12120 Alpha One Gen 1 impeller water pump kit, for 1984-1990 models, serial numbers 6854393-OD469858. Replaces OEM and Sierra 18-3320. $42.99

21950 Alpha 1 adhesive hinge pin tool 30-803097T1

21950 Alpha 1 with adhesive hinge pin tool

P/N 21950K *most popular* Same kit as above, also includes bellows adhesive glue and hinge pin removal/installation tool $199.99

12110 years 1970-1990 46-57234A3

P/N 12110 Mercruiser R MR stern drive water pump kit, for 1970-1983, serial numbers 2663442-6225576. Replaces Mercury and Sierra 18-3317. $44.99

21960 Alpha one Gen 2 kit 1991 up 30-803099T1

P/N 21960 Kit with exhaust, u-joint and shift cable bellows with gimbal bearing and oil seal. Includes outdrive installation gasket. The gimbal bearing is the new sealed type which is maintenance free. Replaces Mercury part number 30-803099T1 $169.99

21960 Generation 2 exhaust u-joint

P/N 21960K *most popular For Generation 2 models only, 1991 and up. Also includes bellows adhesive glue and hinge pin removal/installation $219.99

21450 Shift cable 865436A03

P/N 21450 Complete outdrive lower unit shift cable kit. Includes cable, shift bellow, outdrive installation gasket kit and other parts. Replaces Mercury 865436A03 and Sierra 18-2603. $89.99

11500 GM 350-305 5.7L Mercury 76850A2

P/N 11500 Outdrive engine coupler for GM Chevy 4 cylinder, V6 and V8 1985 and older with a 2 piece rear main seal, will NOT work with 1 piece rear main seal type. Circular mount only will not work with triangular mount. Replaces Mercury 76850A2 and Sierra 18-2171. $217.99

Compatible with models with a 1 piece rear main seal:
110 serial number 1537370-204403
120 2.5L s/n 6229718 - Up
140 3.0L s/n 6229718 - up
160 s/n 2048022-2770031
165, 6 cylinder s/n 2770032 - up
185 s/n 6330183 - up
190 s/n 1564539 - up
898 s/n 4762210
205 (262 CID) s/n A331455-B527954
225 s/n 539620-2694014
228 s/n 4765100-6218461
230 (5.0L) 6218462-B525981
250 s/n 4768000-4908849
260 s/n 4908850-6218461
260 (5.7L) s/n 6218462-B525981