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OMC 800/Cobra parts *Sterndrive drawings *How to videos

400-800 rebuilt upper gearcase cost *1972 to 1985

OMC 400 800 and Stringer rebuilt upper gear case years 1972 to 1985

  • Rebuilt OMC 800 / 400 large hole mechanical shift
  • Stringer upper gear case years 1973 to 1977 electric shift small wire hole
  • Low profile or high profile (1970 to 1972) available
  • Engine gear ratio application chart 4 cylinder, V6, V8
  • Compatible with OMC electric, hydraulic and mechanical shift lower units
  • To determine if you require a standard rotation or counter rotation upper gearcase, see our 400 / 800 steering page
  • To determine which ratio you need, see our gear ratio page
  • To order a new or rebuilt gear case contact us at: (416) 751-7326

Exploded View Drawings
Photo and index page

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$360 core charge deposit will be refunded after we receive your core (trade in)

OMC rebuilt 400-800 Stringer outdrive upper gearcase
OMC rebuilt 400-800 Stringer outdrive upper gearcaserebuilt 400-800 Stringer outdrive upper gearcase

upper gearcase gears
upper gearcase gears

  • Rebuilt unit includes:Removal and shimming
  • New Parts:
  • Gears (drive / driven)
  • Water pump shaft / drive shaft
  • 4 Bearings
  • Oil seals, o-rings and gaskets
  • Water pump assembly (impeller housing and impeller)
  • Ball gear, plug, shims and nut
  • For a complete list of new parts installed, please see: OMC 800 outdrive page

Machined parts:

  • Pinion gear drive shaft*
  • *If drive shaft groves from seal wear requires machining of more than .010 of an inch or water pump shaft splines male or female are more than 20% worn, new shafts will be installed into the upper gearcase housing

Different size engines require different gear ratios in the drive. The manufacturer changes these ratios with different gear sets. The gear ratio change is in the upper gear housing*. All 1973 - 1985 OMC upper gear housings are identical** except for the tooth count on the gears and left or right steering worm gear. Below is a chart showing the tooth count for the different size engines used with OMC sterndrives.
*All lower gear housing ratios are either 2.0:1 for the four-cylinder engines or 1.83:1 for the six,, and eight-cylinder engines.
**The original driven gears in 1970 - 1974 upper gear housings are not machined for a centering cone. All 1975 and newer driven gears and all GLM replacement driven gears are machine for a centering cone. A new drive shaft with shorter splines and a centering cone must be installed when replacing the original (non-centering cone) driven gear.

OMC Stringer / 800 series rebuilt upper gearcase - low profile

$1595.00 *after trade in* OEM 987242

Rebuilt high profile upper gear case

$1699.09 *after trade in*

New high profile Stringer $2499.09 *after trade in*

Engine

Gear Ratio

GLM #

4 Cylinder engines with 120 hp. Years 1970 to 1977 will have used gear set installed in rebuild units

16 / 20
Call to order

4 Cylinder engines with 140 hp. Years 1970 to 1977 will have used gear set installed in rebuild units

19 / 20
Call to order
4-cylinder engines 1978 and up

$1499.09 *after trade in*

21 / 18

RIght hand steering

Left hand steering
P/N 27500R
OEM 982486

3.8L 229 cubic inch V6
$1499.09 *after trade in*
21 / 20

RIght hand steering

Left hand steering
P/N 27400R
OEM 982739

165 to 190 hp. with inline 6-cylinder years 1972 to 1977
$1499.09 *after trade in*
21 / 19

RIght hand steering

Left hand steering
P/N 27300R
OEM 981229

 4.3 Litre 262 / 264 cubic inch V6 years 1986 and up
$1499.09 *after trade in*
21 / 19

RIght hand steering

Left hand steering
P/N 27300R
OEM 981229

5.0L / 302 Ford V8
$1499.09 *after trade in*
21 / 17

RIght hand steering

Left hand steering
P/N 27200R
OEM 982487

5.0L / 305 Chevy V8
$1499.09 *after trade in*
21 / 17

RIght hand steering

Left hand steering
P/N 27100R
OEM 982488

5.7L / 350 Chev. V8
$1499.09 *after trade in*
21 / 16

RIght hand steering

Left hand steering
P/N 27100R
OEM 982488

5.8L / 351 Ford V8
$1499.09 *after trade in*
21 / 16

RIght hand steering

Left hand steering
P/N 27100R
OEM 982488

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