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Transmission - New Replacement 10M

Part #: Z4099

Price: $2,629.97

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This replacement transmission is manufactured by ZF as a replacement for the Hurth transmissions originally installed on most Universal Diesel engines. Just in case you are unfamiliar with the name, ZF supplies transmissions to Mercedes and BMW as well as drive systems for super tankers.

Smaller engines were originally equipped with the Hurth HBW50 transmission. Larger engines used the HBW100 transmission. Unfortunately, the smallest transmission has been discontinued entirely. However, this replacement transmission, ZF's 10M with a 2.05:1 reduction ratio, is a bolt-on replacement for both transmissions except it is about 1" longer front to back than the original HBW50. In the case of the larger transmission, the HBW100, the overall length of this replacement ZF 10M, is the same.

Sadly, this small transmission, the closest replacement to the HBW50 is built in limited quantities which drives its price up. In fact many customers report they are being told this transmission no longer exists. This is not true. We have been receiving 10M transmissions regularly. For a less expensive replacement (that has more differences) consider the 12M transmission offered below under "May we also suggest"

Critical Dimensions (see "Read More" below for detailed specifications)
  • Front to back (L + L3) : 207mm (8.15")
  • Output shaft drop from crank: 72mm (2.83")
  • Reduction ratio: 2.14:1

    Important differences when compared to HBW 50 transmission
  • Front to back (L + L3) : +25mm (+0.98")
  • Output shaft drop from crank: No change
  • Reduction ratio HBW50 vs 10M: 2.05:1 vs. 2.05:1 (same)

    Important differences when compared to ZF 12M transmission
  • Front to back (L + L3) : -12mm (-0.47")
  • Output shaft drop from crank: -10mm (-0.39")
  • Reduction ratio 10M vs 12M: 2.05:1 vs. 2.14:1

    Engines that originally used the HBW50 transmission:
  • 5411
  • M12
  • M2-12
  • M-18
  • M-320
  • M-25
  • M-25XP
  • M-25XPB

    Engines that originally used the HBW100 transmission:
  • M-35
  • M-35B

    Boats that may be able to use this transmission include:
  • Capri 26
  • Catalina 25
  • Catalina 27
  • Catalina 28
  • Catalina 30
  • Catalina 310
  • Catalina 34
  • Catalina 350
  • Catalina 36
    There may be others as well, and not all of the above listed boats can use this transmission. Check the model of your engine to be sure.

    Important notes:
    1) In most cases the extra length of this transmission compared to the original HBW50 will not cause an issue. But in some boats, the Catalina 28 MkII for example, the extra length makes installation a challenge. It is your responsibility to compare all dimensions before ordering to insure this transmission will be a proper fit to your boat.

    2) This is an oversize item which does not conform to our standard shipping policies. Call 800/959-SAIL for a shipping estimate.

    3) A 50% deposit will be billed when your order for this special order item is accepted. The balance will be billed when the product ships.

    4) When you order a special order item it sets off a chain of events like Willie Wonka in the chocolate factory. Once you turn the valve the chocolate is coming down the pipe. If you then decide you want caramel, the chocolate is still going to come out of the pipe. We can't put the Chocolate back in the pipe, so someone is going to have to eat it, and it's not going to be us! Your order can't be canceled, returned, or magically changed into caramel, so please order carefully the first time!

  • More Images: (click to enlarge)

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    ZF 10 M Transmission Specifications

    May we also suggest:
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    Damper Plate, Aftermarket, M-25XPB, M-35B

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    Damper Plate, OEM, 5411, M-12, M2-12, M-18, M-320, M-25, M-25XP

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    Damper Plate, OEM, 5424, M-30, M-35

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    Transmission - New Replacement 12M