# 3861639 Lower Gear | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta lower gear for the 1.68:1 ratio, from the Marine Propulsion group, weighing 84 kg and listed for 1 application in the DP series. It supersedes part number 3803581, which was catalogued earlier as a remanufactured lower gear, so the remanufactured unit is now covered by this number. Upper gear 3861640 is its counterpart in the same drive.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta DP-G

-   **Engine Family:** DP

## ⚙️ Key Features

-   1.68:1 ratio
-   84 kg
-   1 application in the DP series
-   Supersedes 3803581, catalogued earlier as a remanufactured lower gear

## 🔌 Function

Carries the drive down through the leg to the propeller shafts at the 1.68:1 reduction.

## ⚠️ Common Signs of Failure

-   Whine or howl from the leg that changes with load
-   Clunk or hesitation when engaging forward or reverse
-   Water in the drained drive oil, or oil turned grey and creamy
-   Metal glitter or flakes on the drain plug magnet
-   Play felt at the propeller shaft, or the shaft running out of true

## 🛠️ Service Notes

-   Confirm the 1.68:1 ratio before ordering, as gear ratios are not interchangeable
-   At 84 kg this is a freight item and needs lifting equipment, so plan handling and delivery access before ordering
-   Renew seals and drive oil with the gear, and check upper gear 3861640 at the same time

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   3861639 → Supersedes 3803581

### OEM / Related Numbers

-   3803581 earlier number superseded by this part

## 📦 Condition

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

## Details

- **Price:** 13420.34 AUD
- **Vendor:** Volvo Penta
- **Type:** Transmission & Gearbox
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 13420.34 AUD | In stock |

## Images

- 3861639 Lower Gear | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3861639-lower-gear-genuine-volvo-penta)
> Updated: 2026-10-07