# 21884026 Gear Set | Genuine Volvo Penta Part

## 🔧 Product Description

This genuine Volvo Penta matched gear pair is used in AQ290 DuoProp and DP-D1 sterndrives with a 1.78:1 reduction ratio. The lapped gears must remain together as a set.

## ⚙️ Key Features

-   Matched upper-gear pair
-   Reduction ratio: 1.78:1
-   AQ290 DP and DP-D1 application
-   Factory tooth-contact pattern
-   Drive serial and ratio verification required

## 🔌 Function

Transfers engine torque through the sterndrive at the specified reduction ratio.

## ⚠️ Common Signs of Failure

-   Gear whine
-   Pitting or chipped teeth
-   Metal in gear oil
-   Incorrect backlash or contact pattern
-   Loss of drive

## 🛠️ Service Notes

-   Gear sets are supplied as a matched set and must be fitted complete — never run a new gear against a used mate, and keep the set together as it was delivered
-   Setting up requires the shimming, backlash and tooth contact pattern checks in the workshop manual for your engine and drive, together with the proper measuring and pressing tools; this is not a fit-and-hope job
-   Establish why the old set failed before assembly — debris, a collapsed bearing or oil starvation will destroy the new gears just as quickly
-   Renew the bearings, seals and locking hardware at the same time, and flush the housing thoroughly so no metal debris is left in it
-   Fill with the oil specified for your drive, then check the oil early in service for signs of abnormal bedding-in debris

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   21884026 → Supersedes 3861458 → Supersedes 854464 → Supersedes 853532

### OEM / Related Numbers

-   3861458 earlier number superseded by this part
-   854464 earlier number superseded by this part
-   853532 earlier number superseded by this part

### Other-Brand OEM Numbers

-   VOE21884026

### Aftermarket / Verified Equivalents

-   Earlier/related ratio reference: 853532
-   Related gear-set reference: 3860904 - verify drive revision

## 📦 Condition

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

## Details

- **Price:** 4040.05 AUD
- **Vendor:** Volvo Penta
- **Type:** Transmission & Gearbox
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 4040.05 AUD | In stock |

## Images

- 21884026 Gear Set | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21884026-gear-set-genuine-volvo-penta)
> Updated: 2026-10-11