OMC Parts / OMC Cobra Stern Drive Tech Drawings

OMC 800 new lower unit gearcase

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OMC 800 new lower unit gear housing assembly for years 1982 thru 1985
  • Aftermarket replacement OMC 800 lower unit gear housing assembly for years 1982 - 1985 (V6 and V8) with mechanical shift*
  • *Will not fit the 1978 - 1981 with hydraulic shift
  • Lower unit gear housing assembly includes the new heavy duty gear set (#22666) capable of operating up to 300hp
  • Large prop shaft diameter (1 - 1/4")
  • Reverse thrust washer installed in between the shaft and reverse gear
  • Gear ratio: 12:22
  • Individual gears and clutch dogs also available
  • For the 1986 - 1993 OMC stern drive, see our Cobra complete upper gear housing assembly page

To order a new or rebuilt gear case contact our 24 hour gear case order line: (647) 710-3787

All GLM replacement lower gear housings for the V6 and V8 OMC Stringer 800 sterndrives have the new heavy duty #22666 gear sets. This new gear set has fewer, larger, stronger teeth. The pinion gear has 12 teeth and the forward and reverse gears have 22 teeth. The original OEM gear set has 14 teeth on the pinion and 26 teeth on the forward and reverse gears. During the gear machining process an additional pass is made over each tooth for a finer surface. This makes the gear operation especially quiet. These durable gears are capable of operating with up to 300hp. All GLM lower gear housings have the large 1-1/4 inch diameter prop shafts with a reverse thrust washer installed between the shaft and reverse gear**.
 
*Many 1978 - 1981 OMC sterndrives have had the hydraulic shift lower gear housing replaced with the 1982 - 1985 mechanical shift lower gear housing. Sterndrives with the original hydraulic shift lower gear housing do not have an ESA (electronic shift assist) box or overstroke switches on the shift converter. 1978 - 1981 sterndrives that have been converted to the mechanical shift lower gear housing do/must have the ESA and overstroke switches installed.

Click photo for gear information
22666 OMC Gear set all V6-V8 with high alloy steel.jpg
22666 OMC Gear set all V6-V8 with high alloy steel

 #28830 Complete 800 lower gear housing assembly with heavy duty gears

$2349.09 *after trade in*

  OEM # 987242

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

#28830 - Lower unit gear housing

Year

3.8L V6
1981 - 1985
4.3L V6
1985
200-230HP 5.0L V8
1981 - 1985
260HP 5.7L V8
1981 - 1985