Marine Gears

PATH: Contents » Boat Production » Boat Equipment » Propulsion »

^ Types of Gears
^ Marine Gear Manufacturers
^ 1912 Directory of Marine Reverse Gear Manufacturers
^ Draft Resource – Comparing Marine Gears
NOTE: Page under Development. Almost Done!

Types of Gears

Vertical Offset Inboard

PRM 80 Left Side

PRM 80 Vertical Offset Inboard (Left Side)

Down-Angle Inboard

ZF 85 A Down Angle Gear

ZF 85A Down-Angle Inboard Gear

Coaxial (Inline) Inboard

Borg Warner Velvet Drive with Planatary Reduction Gear

Borg Warner Velvet Drive transmission with Planetary Reduction Gear

V-Drive Inboard

Borg Warner Velvet Drive with V-Drive

Borg Warner Velvet Drive with V-Drive

Borg Warner Velvet Drive with Walters V-Drive

Walters V-Drive attached directly to a Borg Warner Velvet Drive transmission.


2_Sterndrive_product_mini1      2_Sterndrive_product_mini2




VP Sail

Pod Drive


Surface-Piercing Drive


Gear Types Flyer – Vertical Offset, Down-Angle & Coax (1pg PDF) from Seaboard Marine

Marine Gear Manufacturers

Allison Transmission
Arneson Drive (Twin-Disc)
Borg Warner (Velvet-Drive)
Capitol Gears
Detroit Diesel Gear
General Motors gear
Hurth (ZF)
Joe’s Gears
Kanzaki (Yanmar)
Mathway (Parsons)
Newage (PRM/Newage)
Parsons Mathway Marine
Regal-Beloit (Velvet-Drive)
Walters Gear (V-Drives)
Yanmar (Kanzaki)
ZF Friedrichshafen AG
ZF Hurth (ZF)

1912 Directory of Marine Reverse Gear Manufacturers

266362_  266363_More from

  1. Baldridge
  2. Gray
  3. Ferro
  4. Little Joe’s
  5. Johnson Marine
  6. The Navy Gear
  7. Palmer
  8. Standard
  9. Paragon
  10. Ball
  11. The Automatic
  12. Westman
  13. Oxford
  14. Wolverine
  15. Pearl
  16. Michigan Wheel Co.
  17. National Gears
  18. Gies Gears
  19. Marine Iron Works Gears
  20. The Capitol
  21. Perfection
  22. Tuttle

Draft Resource – Comparing Marine Gears

This Twin Disc MG506 transmission is very popular model. It was the standard transmission that cummins supplied with the early 5.9L engines before the ZF/Hurth 63 series. It is on par with the ZF63 which tends to be a little noisier. They are both multi-shaft trannys in aluminum cases which usually need oil coolers with the 5.9L to keep them cool. The Borg-Warner Velvet-Drive which was the most popular behind the Ford Lehman/American Marine 120/109 is an inline shaft tranny with planetaries in a cast iron case which makes it much stronger , but heavier. The Velvet-Drive CR2 version had the gear nut problem. Then some early Lehman/American engines had Paragon trannys which were ok, but seemed to require more repair.

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