OMC 400 & 800 Series Sterndrives 1978-1985

Complete 400 and 800 Series OMC Sterndrives

Gearcases, upper drive shaft housings, and complete outdrives for 78-85 OMC full-mechanical 400 and 800 series sterndrives. New and rebuilt drives are covered by a one-year limited warranty.

Prices include shipping in the continental US.

 

NEW 400/800 Full-Mechanical Lower Units Without Shift Cap & Cable

HP Cyl Liters Part Number Price
120 - 140 Large Gearcase 4 2.5 - 3.0 OM-FML-4-N $1,895
170 - 260 6 - 8 3.8 - 5.7 OM-FML-68-N $1,895
Lower Gearcases for 400 and 800 Series Sterndrives

Lower units do not come with a shift cap & cable assembly. When replacing a hydro-mechanical lower unit, you will need a new shift cap and cable, or you can replace the cable and modify your cap to work with the full-mechanical lower unit.

Hydro-Mechanical Shift Cap Modification

Hydro-Mechanical Shift Cap Modification

When upgrading from hydro-mechanical to full-mechanical, you will need to replace the shift cable and modify your old shift cap to work with it. There are two tabs extending down under the cap. In some cases, the forward tab (see image) needs to be cut flush with the bottom of the cap to avoid interference with the installation.

We no longer carry the shift cables, but you can usually find a new or used one here.

 

OMC 400/800 Upper Drive Assembly

HP Cyl Liters Description Part Number
120 - 140 4 2.5 - 3.0 New OM-FMU-4-N
170 - 185 6 3.8 New OM-FMU-6-N
185 - 230 8 5.0 New OM-FMU-81-N
260 8 5.7 New OM-FMU-82-N
Uppers for 400 and 800 Series OMC Sterndrives

New and remanufactured OMC 400/800 series uppers are currently unavailable, but you can use this link to search for a used one:

Used OMC 400/800 Sterndrive Upper Drive Assembly

 

Complete OMC 400/800 Series Full-Mechanical Sterndrives

HP Cyl Liters Description Part Number
120 - 140 4 2.5 - 3.0 New Upper/Rem Lower OM-FMC-4-NR
170 - 185 6 3.8 New OM-FMC-6-N
185 - 260 8 5.0 - 5.7 New OM-FMC-8-N
Complete 400 and 800 Series OMC Sterndrives

New and remanufactured OMC 400/800 series complete sterndrives are currently unavailable. You can order the new full-mechanical lower unit listed above and use these search links to find alternate sources for the other parts:

 

Important Info

Be sure to include your engine model number when ordering.

All units are shipped without oil. Be sure to use the proper oil and filling procedure that's recommended in your owner's manual.

New 4-cylinder lower units aren't available for small-gearcase models.

New units are assembled with all new parts that meet or exceed OEM specs and/or OEM parts, depending on availability.

Click here for more OMC sterndrive parts.

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