This is an aftermarket replacement for the MerCruiser Zeus Transmission and Power Steering Oil Cooler. Note the internal configuration of this cooler is very important to proper cooling.

There are three configurations for these transmissions:

Configuration 1:  Zeus Transmission Cooling system without Drop Box cooler

• 879148T59 Mercruiser® Zeus Transmission Cooler
• Superseded to 8M0181739 Mercruiser® Zeus Transmission Cooler

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Configuration 2:  Zeus Transmission Cooling system with Drop Box cooler
The Transmission cooler you would use:

• 879148T59 Mercruiser® Zeus Transmission Cooler
• Superseded to 8M0181739 Mercruiser® Zeus Transmission Cooler

you may also need this Drop Box cooler:

• 897345T95 Mercruiser® Drop Box Cooler 
• Superseded to 8M0037727 Mercruiser® Drop Box Cooler.

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Configuration 3:  Zeus Transmission Cooling system with Mercruiser® Drop Box Cold Water Cooler
The Transmission cooler you would use:

• 8M0041652 Mercruiser® Transmission / Gear Oil Cooler
• Superseded to 8M0181550 Mercruiser® Transmission / Gear Oil Cooler
• Oldest known number 879150A79 Mercruiser® Transmission / Gear Oil Cooler

you may also need this Drop Box Cold Water Cooler:

• 8M0036211 Mercruiser® Drop Box Cold Water Cooler
• Superseded to 8M0181781 Mercruiser® Drop Box Cold Water Cooler
• Oldest known number 879150A80 Mercruiser® Drop Box Cold Water Cooler