OMC parts *800 Cobra outdrive drawing *Video

T.C. Electronics/Marine (416) 751-7326 Home Page

Remanufactured OMC Cobra lower units

Rebuilt lower unit gear case

  • Rebuilt large housing assembly for years 1986 - 1993 (V6 and V8) and 1990 - 1993
  • 4 cylinder 3.0L. small gear housing assembly for years 1987 - 1990 (2.3L 4-cylinder Ford) and 1986 - 1989 (3.0L 4-cylinder Chevy)
  • Rebuilt gear cases include aftermarket or original OEM - gear sets. Large gear housing ratio: 14:26 (OEM gears) - Small gear housing ratio 13:26
  • New 1 - 3/16" prop shaft and gear set installed in every unit
  • For rebuilt upper units, see our Cobra rebuilt upper gear case page
  • Individual gears also available
  • 90 day warranty from time of install
  • To order a new or rebuilt gear case contact us at: (416) 751-7326 New installed parts included in rebuild list below
  • Exploded view OMC drawings

P/N 28820 - Large Gear Housing 4-1/4 inch hub

3.0 Liter 4 cylinder Chevy 1990 - 1993
4.3 Liter V6 1986 - 1993
5.0 Liter Chevy/Ford 1986 - 1993
5.7 Liter Chevy 1986 - 1993
5.8 Liter Chevy 1989 - 1993

Part Description Part #

Pinion bearing 21610
Detent 27720
Screws 22375, 22366, 22373
Gaskets 33960, 33970, 31171
Seal 86620
Guide 12961
Nuts 21180
Washers 21490
Bearing housing 27770
Shims 23590
Thrust washer 21645
Thrust bearing 16330
Pinion and forward gear (original OMC set) 22623
Anodes (3 units) 12774, 12776, 12737
Plug 21731
Forward gear bearing 22910
Spring 11052
Prop shaft (1-3/16" diameter) 22414
Reverse gear bearing 22870
Bearing 11410 Oil seal 85130

OMC Cobra parts drawing lower gearcase

28820R OMC stern drive rebuilt lower gear case

P/N 28910 - Small Gear Housing

2.3 Liter 4-cylinder Ford 1987 - 1990
3.0 Liter 4 Cylinder Chevy 1986 - 1989

Core charge deposit of $360 is refunded after we receive your core trade in.

P/N 28820R
Remanufactured Cobra stern drive lower gear case with original gears $1595.95 *after trade in*

P/N #28910R
Rebuilt small housing Cobra lower gear case $1595.95 *after trade in*