# 3855909 Gear Under | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta lower gear unit from the Marine Propulsion group, weighing 30.999 kg and listed for one application in the DP drive family. It is not illustrated in the parts arrangement and supersedes part number 3803268, which was catalogued earlier as a remanufactured lower gear.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta DP-S

-   **Engine Family:** DP

## ⚙️ Key Features

-   Not illustrated in the parts arrangement
-   30.999 kg
-   Supersedes 3803268
-   One application in the DP drive family

## 🔌 Function

Carries the drive from the vertical shaft to the propeller shafts and sets the final reduction between engine and propeller.

## ⚠️ Common Signs of Failure

-   Whine or growl from the drive that changes with load
-   Milky gear oil pointing to water ingress
-   Metal particles on the drain plug magnet
-   Play or roughness at the propeller shafts
-   Pitted or broken gear teeth on strip-down

## 🛠️ Service Notes

-   No ratio is published against this number, unlike 3855906 at 1.68:1 and 3855907 for the 2.11:1 and 1.78:1 ratios, so confirm the ratio before ordering
-   Because the superseded number was listed as a remanufactured lower gear, check whether this number supplies a new or an exchange unit
-   Renew the lower gear unit sealing kit 3856002 while the drive is apart

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3855909 → Supersedes 3803268

### OEM / Related Numbers

-   3803268 earlier number superseded by this part

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 11137.15 AUD
- **Vendor:** Volvo Penta
- **Type:** Transmission & Gearbox
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 11137.15 AUD | In stock |

## Images

- 3855909 Gear Under | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3855909-gear-under-genuine-volvo-penta)
> Updated: 2026-10-09