Mercruiser lower unit / upper gearcase application chart

Mercruiser Parts Warehouse & Stern Drive Drawings

Mercruiser lower unit / upper gearcase application chart

GLM Mercruiser upper gearcase - lower unit application chart

Stern drive application chart for the Mercruiser MC-1/R/MR/Alpha 1 (one)

Model, gear ratio, serial number range and year range listed in chart

See our Mercruiser lower unit drawing page for a complete list of parts

For upper gearcase parts, see our Mercruiser upper gearcase page (includes technical drawing breakdown for easy part identification)

See our complete lower unit page for more information on our GLM aftermarket #18100 gearcases

Model

Ratio

Years

Serial #

Lower unit

Upper gearcase

120 / 140

1.98

1967 thru 1969

2062141 thru 2791956

N.L.A.

N.L.A.

120 / 140

1.98

1970 thru 1982

2791957 thru 6225576

18100

19400

470 / 485

1.84

1976 thru 1982

4208730 thru 6225575

18100

19300

160

1.65

1967 thru 1969

2065190 thru 2762441

N.L.A.

N.L.A.

165

1.65

1970 thru 1981

2763442 and Up

18100

19200

888

1.50

1971 thru 1977

3106717 and Up

18100

19100

225-S

1.50

1974

3856268 thru 4200499

18100

19100

233

1.32

1975 thru 1977

4200500 and Up

18100

19500

898 / 228 / 260

1.50

1977 thru 1982

4782330 thru 6225576

18100

19100

250

1.32

1977

4791300 thru 4898729

18100

19500

R

1.98

1983

6225577 and Up

18100

19400

R

1.65

1983

6225577 and Up

18100

19200

R

1.84

1983

6225577 and Up

18100

19300

R

1.50

1983

6225577 and Up

18100

19100

R

1.32

1983

6225577 and Up

18100

19500

MR / Alpha One

1.98

1984 thru 1990

6225577 and Up

18100

19400

MR / Alpha One

1.65

1984 thru 1990

6225577 and Up

18100

19200

MR / Alpha One

1.84

1984 thru 1990

6225577 and Up

18100

19300

MR / Alpha One

1.50

1984 thru 1990

6225577 and Up

18100

19100

MR / Alpha One

1.32

1984 thru 1990

6225577 and Up

18100

19500

mercruiser gearcase

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