---
product_id: 312280875
title: "USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD)"
brand: "usa standard gear"
price: "₩1181772"
currency: KRW
in_stock: true
reviews_count: 5
category: "Usa Standard Gear"
url: https://www.desertcart.kr/products/312280875-usa-standard-gear-spartan-locker-helical-limited-slip-differential-worm
store_origin: KR
region: South Korea
---

# Maintenance-free, no lubrication hassle 10-pinion helical worm gear design Forged 8620 chromoly steel internals USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD)

**Brand:** usa standard gear
**Price:** ₩1181772
**Availability:** ✅ In Stock

## Summary

> ⚙️ Unlock unstoppable grip with Spartan Locker’s helical LSD — where power meets precision.

## Quick Answers

- **What is this?** USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) by usa standard gear
- **How much does it cost?** ₩1181772 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/312280875-usa-standard-gear-spartan-locker-helical-limited-slip-differential-worm)

## Best For

- usa standard gear enthusiasts

## Why This Product

- Trusted usa standard gear brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Forged 8620 chromoly steel case and internals ensure rock-solid durability under extreme conditions.
- • **Quiet Confidence:** Experience whisper-quiet operation with smooth engagement that outperforms traditional LSDs.
- • **Plug-and-Play Fitment:** Specifically engineered for Dana 30 Front 27 spline, 3.73+ gear ratios—perfect OEM replacement.
- • **Precision Traction Engineering:** 10-pinion helical design delivers smooth, linear power transfer for unbeatable grip.
- • **Zero Maintenance, Maximum Performance:** Forget friction modifiers and upkeep—this differential is built for hassle-free, long-lasting traction.

## Overview

The USA Standard Gear Spartan Locker Helical Limited Slip Differential is a high-performance Dana 30 front differential upgrade featuring a robust 10-pinion helical worm gear design. Constructed from forged 8620 chromoly steel for superior durability, it offers smooth, maintenance-free traction optimized for 3.73+ gear ratios. Designed for quiet, reliable operation, this unit delivers enhanced load distribution and long-lasting performance, making it the go-to choice for serious off-roaders and daily drivers seeking confidence in all conditions.

## Description

Increase the traction capability of your Dana 30 front diff with the Spartan Helical LSD from USA Standard Gear's Spartan Locker brand. This helical gear design provides years of maintenance-free service. When wheel slippage occurs, its pre-loaded worm gears funnel more power to the tire with the best traction. This 10-pinion USA Standard Gear design has a strength advantage over an equivalently sized 6-pinion or 8-pinion unit because it has more points of contact and more surface contact area to deliver optimal load distribution.Compared to other types of limited slip differentials or positraction units, the Spartan Helical LSD provides smoother engagement, quieter operation, and requires no maintenance. Built tough, the Spartan Helical LSD is a fully assembled unit featuring a forged 8620 chromoly case and stout 8620 chromoly alloy internals for superior durability. Whether you’re facing mud, loose gravel, or steep inclines on the trail or slippery snow or rain on the road, the Spartan Helical LSD will ensure you have unrivalled traction and supreme confidence in your vehicle.USA Standard Gear sets the standard for quality OE replacement parts at affordable pricing. USA Standards provides the widest selection of drivetrain replacement parts, including ring & pinions, axles, Perfect Fit driveshafts, transmission and transfer case components, and installation kits, as well as the Spartan Locker – the toughest lunchbox locker on the market. Designed for the general installer and do-it-yourself customer, USA Standard provides unmatched reliability in replacement drivetrain products.

Review: Was an easy install, running nice and quiet with Revolution gear 4.88's and the Timpken install kit. Seems to be a quality part made in the USA. Only have around 500 miles on it at the moment, will update my review in the future after some proper wheeling trips and real miles.
Review: Cheaper option than an equivalent Eaton, ( trutrac) hope it does the same job

## Features

- FITMENT: Dana 30 Front 27 Spline, 3.73+ Ratio
- METALLURGY: Forged 8620 Steel Alloy Case and Internals for Superior Durability.
- SMOOTH TRACTION: Smooth Engagement and Linear Traction
- MAINTENANCE FREE: Maintenance Free, No Worry Performance
- GEAR OIL: Recommended Gear Oil: Use Non-Synthetic 80w-90 gl-5. Use of Friction Modifiers Not Recommended

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08L8DFGW4 |
| Best Sellers Rank | #174,964 in Automotive ( See Top 100 in Automotive ) #49 in Car Differential Assembly Kits |
| Brand | USA Standard Gear |
| Customer Reviews | 4.6 4.6 out of 5 stars (177) |
| Date First Available | 15 September 2023 |
| Exterior | Machined |
| Item Weight | 6.35 Kilograms |
| Item model number | SL D30-4-27-LSD |
| Manufacturer | Spartan Locker |
| Manufacturer Part Number | SL D30-4-27-LSD |
| Model | Spartan Locker Helical Worm Gear Limited Slip Differential for Dana 30 27 Spline 3.73 & Up |
| Package Dimensions | 23.09 x 21.59 x 21.59 cm; 6.35 kg |
| Special Features | FITMENT: Dana 30 Front 27 spline, 3.73-and-up ratio, GEAR OIL: Recommended gear oil: Non-synthetic 80W-90 GL-5. Use of friction modifiers not recommended, MAINTENANCE FREE: Maintenance free, no worry performance, METALURGY: Forged 8620 chromoly case, 8620 chromoly alloy internals for superior durability, SMOOTH TRACTION: Smooth engagement and linear traction |

## Images

![USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) - Image 1](https://m.media-amazon.com/images/I/71aiQDYLYFL.jpg)
![USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) - Image 2](https://m.media-amazon.com/images/I/71fQ+8QGsnL.jpg)
![USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) - Image 3](https://m.media-amazon.com/images/I/61qmvKpTNbL.jpg)
![USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) - Image 4](https://m.media-amazon.com/images/I/71OtGcUxq5L.jpg)
![USA Standard Gear Spartan Locker Helical Limited Slip Differential Worm Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) - Image 5](https://m.media-amazon.com/images/I/71X-tDqbw7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by L***O on 29 October 2025*

Was an easy install, running nice and quiet with Revolution gear 4.88's and the Timpken install kit. Seems to be a quality part made in the USA. Only have around 500 miles on it at the moment, will update my review in the future after some proper wheeling trips and real miles.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 17 June 2023*

Cheaper option than an equivalent Eaton, ( trutrac) hope it does the same job

### ⭐⭐⭐⭐⭐ Review
*by A***A on 14 August 2023*

Lo puse para mi Cherokee que uso para rutas de dificultad moderada pero en lugares donde solía batallar más cuando pierdes tracción en dos ruedas, te ayuda a seguir avanzando lo suficiente en la mayoría de los casos para volver a tener tracción, solamente aplico el freno para activarlo y hasta ahora me ha funcionado muy bien!

## Frequently Bought Together

- Spartan Locker Helical Limited Slip Differential Worm Gear Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD)
- Yukon Gear & Axle (YK D30-F) Front Master Overhaul Kit for Dana 30 Axle

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-03*