Johnson outboard lower unit replacement

Johnson outboard lower unit SEI replacement

Type "O" Johnson / Evinrude 1979 to 2006 all new SEI gearcase replacement with no core required.

Last updated on 11/14/2023

V4 gear ratio 2.25:1 teeth 12:27 without speedo 5004639
V6 gear ratio 1.83:1 teeth 12:22 without speedo 5005401
V6 gear ratio 1.83:1 teeth 12:22 with speedo 5004635

Johnson outboard lower unit aftermarket SEI replacement

Lower unit

Shafts are available that clip into lower units for 20 and 25 inch transoms if required. If reusing the old shaft you will have to disassemble your old unit and remove the pin that’s holds the shaft in place. Please see upper drive shaft page for new shafts.

28880 Complete gearcase V4

P/N 28880 Complete aftermarket replacement gearcase with out speedo for OMC V4 gear ratio 2.25:1 teeth 12:27 OEM 5004639

100 hp. WPL 20 inch transom year 1999
100 hp. WPX 25 inch transom year 1999
100 hp. Commercial 20-25 inch transom 1988-1997
100 hp. WQ,X, and 105 hp. WEX 25″ transom 1998
105 hp. Commercial WPL 20″ transom 2000-2001
105 hp. Commercial WPX 25″ transom 2000-2001
105 hp. Commercial WEL 20″ transom 2000-2001
105 hp. WEL 20 inch transom year 1998
105 hp. WRL 20 inch transom years 1997-1998
105 hp. WRX 20 inch transom year 1997-1998
105 hp. RWL 20 inch transom year 1998
105 hp. RWY 20-1/5 inch transom year 1998
105 hp. RWX 25 inch transom year 1998
115 hp. FPX / FX 25 inch transom years 2000-2001
125 hp. RWL 20 inch transom years 1995-1997
125 hp. RWY 22-1/2 inch transom years 1995-1998
125 hp. WPTL 20 inch transom years 1992-1998
125 hp. WTPX 20 inch transom years 1988-1998
130 hp. 20 and 25 inch transom years 1995-1998
V4 60 degree Loop charged 25″ transom 1995-2006
140 hp. 25 inch transom years 1988-1994

$1195.00

$146.89

28810 V6

P/N 28810 GLM replacement lower unit with out speedo for OMC V6 gear ratio 1.83:1 teeth 12:22 OEM 5005401

135 hp. FSL / FS 20 inch transom 2000-2001

135 hp. FPX / FX 25 inch transom 2000-2001

V6 60 degree loopcharged 20 inch transom with external screens years 1995-2000

V6 60 degree loopcharged 25 inch transom with external screens years 1991-1999

150 hp. Commercial 20 and 25 inch transom year 1993-1999

155 hp. Commercial 20 and 25 inch transom year 1988-1992

$2599.00

$3571.89

28710 V6 with speedo

P/N 28710 Complete aftermarket gearcase with speedo for OMC V6 gear ratio 1.83:1 teeth 12:22 with speedo OEM 5004635

135 hp. FPL/FL 20 inch transom years 2000-2001

V8 Crossflow 20 inch transom and 90 degree loopcharged years 1988-1991

V6 Crossflow 25 inch transom and 90 degree loopcharged years 1988-1991

V6 90 degree loopcharged 20 inch transom years 1992-1999

$2299.00

$4317.89

Side and top view

Large Gearcase “0” Type V4 and V6 years 1979 to 2006

Physical Characteristics are:
19-3/16 inch tall.
Cavitation plate to propeller shaft 8-1/4 inch.
Hub area 4-5/8 inch.
Straight at the trailing end of the gear housing and the fin.
Pointed at the trailing end of the cavitation plate.
Two slots above the cavitation plate.
External water intake screens.