# 3852404 Drive Gear Set | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta drive gear set for the 1.66:1 and 1.97:1 ratios, listed for 14 applications on the SX drive series. It supersedes part number 3850939, catalogued earlier as a gear set.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta SX-RT2
-   Volvo Penta SX-S
-   Volvo Penta SX-ST
-   Volvo Penta SX-C
-   Volvo Penta SX-C1
-   Volvo Penta SX-C2
-   Volvo Penta SX-CT
-   Volvo Penta SX-CT1
-   Volvo Penta SX-CT2
-   Volvo Penta SX-M
-   Volvo Penta SX-M1
-   Volvo Penta SX-MTD
-   Volvo Penta SX-MTD3
-   Volvo Penta SX-RT1

-   **Engine Family:** SX

## ⚙️ Key Features

-   For the 1.66:1 and 1.97:1 ratios
-   Supersedes 3850939
-   14 applications on the SX series
-   Order by ratio, not by weight

## 🔌 Function

Provides the meshed gear pair that turns the drive through its designed reduction ratio.

## ⚠️ Common Signs of Failure

-   Whine or howl from the drive that tracks engine load
-   Glitter or chips found on the oil drain magnet
-   Tooth flanks pitted, scuffed or broken
-   Backlash grown beyond specification
-   Drive oil overheating and smelling burnt

## 🛠️ Service Notes

-   This set is published at 0.633 kg while the other three ratios are all around 2.05 to 2.08 kg - the low figure looks like an error, so do not use weight to check what has arrived
-   Ratio decides the order - 1.51:1 and 1.79:1 as 3852402, 1.60:1 and 1.89:1 as 3852403, 1.66:1 and 1.97:1 here and 2.18:1 as 3852405
-   Fit as a matched pair and reset shims and backlash to specification

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3852404 → Supersedes 3850939

### OEM / Related Numbers

-   3850939 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 2325.03 AUD
- **Vendor:** Volvo Penta
- **Type:** Transmission & Gearbox
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2325.03 AUD | In stock |

## Images

- 3852404 Drive Gear Set | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3852404-drive-gear-set-genuine-volvo-penta)
> Updated: 2026-10-11