New, unpainted ZF 68IV aluminum marine v-drive transmission. Part number 3312003207. Supersedes and directly replaces ZF 63IV (3312003013) and Hurth HSW630V1.

Specifications

• Gear Ratio: 1.560:1 (A), 1.567:1 (B) - Often written as 1.56, 1.5, 1.6
• 12-degree down angle v-drive
• Mechanical shift (contact for electric shift)
• Input Shaft: 26-spline 1-5/16" O.D. (33.5mm)
• Output Coupler: 4-1/4" (108mm) bolt center-to-center diameter with 4 and 8 bolt patterns
• Max RPM: 4000

Features

• For standard-rotation engines only (same as automotive rotation)
• Can be shifted either direction for forward (fully-reversing)
• Oil filter included and replaceable
• Owner's manual included

Important Warranty Information
This transmission includes a 2 year ZF warranty (1 year for commercial duty). Upon receipt, the vessel owner should read and fill out the warranty page near the back of the owner's manual. Installation should always be performed by a trained professional.

ZF has a global service partner network should there be a problem that is covered under the warranty. Please be aware that claims, inspection, and work may be handled by a service partner, subject to their lead times and policies. If you are international, it is a good idea to use ZF's Marine Partner Finder to find the nearest one and make a note in your owner's manual.

Read all of the following carefully as it can affect your warranty:

Oil Cooler
Always replace or service your oil cooler and flush the oil lines. If there had ever been water or debris in the oil, or the old transmission was slipping or failed, reusing the oil cooler can cause debris to enter the new transmission. This can cause damage and void the warranty.

If you need a new oil cooler, you can view a list of coolers here. The transmission oil cooler will vary depending on the engine and boat builder, so yours may not be listed.

Damper Plate
Also called a drive plate, this bolts to the flywheel and engages the transmission input shaft. It dampens the engine firing impulses to protect the transmission. A damaged or worn-out damper plate won't dampen torsionals as well, which can cause damage and void the warranty.

If you need a new damper, you can view a list of dampers here. Since there are many options, it is best to look on your existing damper for casting/part numbers to find a direct match. If this is a new installation or you're converting from a different type of transmission, seek professional guidance on the best damper to use.

Oil Changes and Fluid Types
Check your transmission oil level regularly and change it following the owner's manual guidelines. Never go more than a year between oil changes. Always use an ATF (automatic transmission fluid) that meets Detroit Diesel Allison C-4 specifications (examples: Dexron IIE, Dexron III). Do not use motor oil, even if your boat manual recommends it or there's a sticker on your existing ZF transmission. Using motor oil can void the warranty.

Oil Filter
Replace as needed following the owner's manual guidelines. Find replacement oil filters here.

Adapter Housing
This connects the transmission to the engine bellhousing. Reuse your existing one as long as it is in good condition. If you need a new one, see here for a list of common adapter housings.

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