OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC stern drive Cobra rebuilt lower gear case
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Rebuilt OMC stern drive Cobra lower 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 - OMC 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 OMC stern drive 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 our 24 hour gear case order line: (647) 710-3787
  
New installed parts included in rebuild list below

Part Description
Part #
Estimated Retail Price
Pinion bearing
21610
$32
Detent
27720
$55
Screws
22375, 22366, 22373
$15
Gaskets
33960, 33970, 31171
$15
Seal
86620
$5
Guide
12961
$5
Nuts
21180
$5
Washers
21490
$5
Bearing housing
27770
$78
Shims
23590
$5
Thrust washer
21645
$7
Thrust bearing
16330
$26
Pinion and forward gear (original OMC set)
22623
$489
Anodes (3 units)
12774, 12776, 12737
$38
Plug
21731
$6
Forward gear bearing
22910
$54
Spring
11052
$5
Prop shaft (1-3/16" dia.)
22414
$306
Reverse gear bearing
22870
$16
Bearing
11410
$10
Oil seal
85130
$10

MM-28820R-OMC-stern-drive-rebuilt-lower-gear-case.jpg
# 28820R OMC stern drive Cobra rebuilt lower gear case

#28820 - Large Gear Housing

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

#28910 - Small Gear Housing

Year
2.3L 4-cylinder Ford
1987 - 1990
3.0L 4-cylinder Chevy
1986 - 1989

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

#28820R Remanufactured Cobra stern drive lower gear case with original OMC gears 

$1595.09 *after trade in*

#28910R Rebuilt small housing Cobra lower gear case

$1395.09 *after trade in*

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