IMCO Extreme HP SC Replacement Drive - Upper Only

Our Xtreme Advantage SC drive upper units are available for those who may already own a IMCO, or a stock Bravo lower.

The Billet Aluminum top cap is supported by eight bolts with a controlled water-circulation system and built in spray nozzles to provide maximum cooling to the external upper gear case.

The steel tower in the floor is stabilized through internal lateral support beams to eliminate tower flex and gear deflection.

IMCO has developed a rigid pinion and bearing pack assembly with non-elastic shims to provide the correct rolling torque while stabilizing both input yoke and pinion. Tightened to 75 lb/ft, the pinion assembly is held in place by our plated steel ujoint retainer nut through a direct load-bearing path.

For Replacement Parts:
SC Upper Case Click Here
SC Upper Gear Click Here

NOTE: These parts & unit have no warranty.

NA001831 Perkins Heat Exchanger 6 Cyl - 354 C.I.D. 20-1/2" long; 4" Dia Flange

NA001831CN Perkins Heat Exchanger 6 Cyl - 354 C.I.D. 20-1/2" long; 4" Dia Flange with standard copper nickel (CuNi) core.

WIRE ASSY-GROUND Mercruiser 84-881831

CONTACT SET Mercruiser 87-71831

Dial Indicator Adaptor Kit 91-83155

Attaches the dial indicator to the gear case when checking backlash on MC-1, R-MR, Alpha One Gen II, Bravo One, Bravo Two and Bravo Three drive units.

Mercruiser Holder 91-83163M

Mercruiser Holder Tool 91-83180M

Mercruiser Pinion Gear Location Tool 91-831897

Used On: 120XR2 (Jet Drive) 1999-2000, 120XR2 (Powerhead) 1999-2000, 175XR2 Jet Drive (Powerhead), 175XR2 Jet Drive (Pump), 200 DFI Jet Drive (Powerhead), 200 DFI Jet Drive (Pump), 200 DFI M2 Jet Drive (Powerhead), 200 DFI M2 Jet Drive (Pump), 210 CARB Jet Drive (Powerhead), 210 CARB Jet Drive (Pump), 210 CARB M2 Jet Drive (Powerhead), 210 CARB M2 Jet Drive (Pump), 240 EFI Jet Drive (Powerhead), 240 EFI Jet Drive (Pump), 240 EFI M2 Jet Drive (Powerhead), 240 EFI M2 Jet Drive (Pump)

Mercruiser Mandrel Kit 91-83166M

Used On: 4 (2-STROKE)
5 (2-STROKE)
8 (BODENSEE) 4-STROKE (International)

COUPLING ASSY Mercruiser 18311A10

Supercedes: 18311T10