---
product_id: 247967524
title: "Spartan Locker Helical Limited Slip Differential Worm Gear Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD)"
brand: "usa standard gear"
price: "¥123216"
currency: JPY
in_stock: true
reviews_count: 13
category: "Usa Standard Gear"
url: https://www.desertcart.jp/products/247967524-spartan-locker-helical-limited-slip-differential-worm-gear-positraction-dana
store_origin: JP
region: Japan
---

# Smooth, maintenance-free traction 27 spline fitment precision Forged 8620 chromoly durability Spartan Locker Helical Limited Slip Differential Worm Gear Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD)

**Brand:** usa standard gear
**Price:** ¥123216
**Availability:** ✅ In Stock

## Summary

> 🛠️ Unlock unstoppable traction with Spartan precision!

## Quick Answers

- **What is this?** Spartan Locker Helical Limited Slip Differential Worm Gear Positraction Dana 30 Front 27 Spline 3.73 & Up (SL D30-4-27-LSD) by usa standard gear
- **How much does it cost?** ¥123216 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/247967524-spartan-locker-helical-limited-slip-differential-worm-gear-positraction-dana)

## 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

- • **Precision Fit for Dana 30 Front Axles:** Optimized for 27 spline and 3.73+ gear ratios to ensure seamless compatibility and peak performance.
- • **Effortless, Maintenance-Free Operation:** Experience smooth, linear traction with zero upkeep—focus on the adventure, not the differential.
- • **Unmatched Durability with Forged 8620 Steel:** Built with premium chromoly alloy case and internals engineered to withstand the harshest off-road conditions.
- • **Quiet, Smooth Engagement for Everyday Driving:** Unlike clunky lockers, enjoy whisper-quiet operation that’s undetectable on-road but dominates off-road.
- • **Superior Traction with 10-Pinion Helical Design:** More contact points mean better load distribution and instant power transfer when wheel slip hits.

## Overview

The Spartan Locker Helical Limited Slip Differential is a high-performance Dana 30 front axle upgrade featuring a 27 spline fitment and 3.73+ gear ratio compatibility. Crafted from forged 8620 chromoly steel, it delivers exceptional durability and smooth, maintenance-free traction through a 10-pinion helical worm gear design. Engineered for both rugged off-road challenges and quiet on-road driving, this differential ensures superior load distribution and instant power transfer, making it the go-to choice for serious trail enthusiasts and daily drivers alike.

## 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: Installed on 2011 JK with 4.88's - 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: Amazing traction for the money!!! - I just installed 4.56 gears in my xj and had to get a new carrier for that ratio. This locker seemed like the perfect option, and yes I am calling it a locker. It looked very high quality and had zero runout when I was setting up my gears. For the price these go for you get a new carrier that fits 3.73 and up gears and a locker that is completely undetectable on the road in 2 or 4 wheel drive from what I can tell. And it literally shocked me at how much traction it provides off road. The video I shared is of the first off road trip with the new gears and this locker. My rear end in the back is still just an open carrier so you can really see just how good this Spartan helical locker is when my jeep Gets in a bind. When I started spinning and not going forward, I just tapped the brakes and it locked the front axle up immediately and popped me up and over that rock. I was shocked at how good it worked and was a little bit more jerky with the throttle than I needed to be but the jeep got it done! I hope they make one of these for my chrysler 8.25 rear end and I will definitely buy it. Awesome product, I would give it 10 out of 5 stars if I could.

## 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 | #547,532 in Automotive ( See Top 100 in Automotive ) #279 in Automotive Replacement Differential Assembly Kits |
| Brand | USA Standard Gear |
| Customer Reviews | 4.6 4.6 out of 5 stars (191) |
| Date First Available | October 15, 2020 |
| Exterior | Machined |
| Item Weight | 14 pounds |
| 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 | 9.09 x 8.5 x 8.5 inches |
| 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

![Spartan Locker Helical Limited Slip Differential Worm Gear 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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Installed on 2011 JK with 4.88's
*by L***O on October 29, 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.

### ⭐⭐⭐⭐⭐ Amazing traction for the money!!!
*by R***E on June 9, 2024*

I just installed 4.56 gears in my xj and had to get a new carrier for that ratio. This locker seemed like the perfect option, and yes I am calling it a locker. It looked very high quality and had zero runout when I was setting up my gears. For the price these go for you get a new carrier that fits 3.73 and up gears and a locker that is completely undetectable on the road in 2 or 4 wheel drive from what I can tell. And it literally shocked me at how much traction it provides off road. The video I shared is of the first off road trip with the new gears and this locker. My rear end in the back is still just an open carrier so you can really see just how good this Spartan helical locker is when my jeep Gets in a bind. When I started spinning and not going forward, I just tapped the brakes and it locked the front axle up immediately and popped me up and over that rock. I was shocked at how good it worked and was a little bit more jerky with the throttle than I needed to be but the jeep got it done! I hope they make one of these for my chrysler 8.25 rear end and I will definitely buy it. Awesome product, I would give it 10 out of 5 stars if I could.

### ⭐⭐⭐⭐⭐ Best limited slip on the market save your money on the big brands buy this one instead!!!
*by R***Y on September 7, 2025*

Installed in a 92 XJ and the unit works great showed up in great condition and a timely manner ! My XJ’s front axle is full time no Locking hubs and going down the road you can’t even tell it’s there but once you get it in 4wd it’s great have been able to go more places then I use to be able to with a open Diffrential! It’s quiet and quick to react when you need it! My friends are planning to buy one as well since how great mine did!! The durability of it has been great she held up to a week of full abuse in the dunes!

## 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 Japan*
*Store origin: JP*
*Last updated: 2026-01-25*