---
product_id: 352302622
title: "912A585 Detroit Truetrac 27 Spline Differential for Dana 30"
brand: "eaton"
price: "R15996"
currency: ZAR
in_stock: true
reviews_count: 5
category: "Eaton"
url: https://www.desertcart.co.za/products/352302622-912a585-detroit-truetrac-27-spline-differential-for-dana-30
store_origin: ZA
region: South Africa
---

# Fits Dana 30 front axle, Jeep Wrangler JK ready 27 spline gear teeth precision Maintenance-free helical gear design 912A585 Detroit Truetrac 27 Spline Differential for Dana 30

**Brand:** eaton
**Price:** R15996
**Availability:** ✅ In Stock

## Summary

> 🚀 Unlock unstoppable traction with zero maintenance—your Jeep’s new secret weapon!

## Quick Answers

- **What is this?** 912A585 Detroit Truetrac 27 Spline Differential for Dana 30 by eaton
- **How much does it cost?** R15996 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/352302622-912a585-detroit-truetrac-27-spline-differential-for-dana-30)

## Best For

- eaton enthusiasts

## Why This Product

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

## Key Features

- • **Precision 27 Spline Gear:** Engineered for seamless power transfer and durability under extreme conditions.
- • **Smooth & Quiet Operation:** Experience superior off-road performance without the usual noise and clunk of traditional LSDs.
- • **Maintenance-Free Traction:** Helical gear design eliminates wear parts—just install and conquer every trail without hassle.
- • **Optimized for Dana 30 Axles:** Perfectly tailored for front axle applications on Jeep Wrangler JK and similar rigs.
- • **Versatile Off-Road Champion:** From rock crawling to street muscle, this differential adapts to your lifestyle with unmatched reliability.

## Overview

The Eaton 912A585 Detroit Truetrac is a pioneering helical gear limited slip differential designed for Dana 30 front axles, especially Jeep Wrangler JK models. Featuring 27 spline teeth and a 7.2-inch ring gear, it delivers smooth, quiet, and maintenance-free traction ideal for off-road, towing, and street performance. Trusted for toughness and reliability, it’s the go-to upgrade for professionals seeking enhanced vehicle control without compromise.

## Description

The Detroit Truetrac was the first helical gear differential ever introduced into the automotive aftermarket as an Eaton brand. It remains the leading helical gear-type limited slip differential in the industry. Detroit Truetrac's proven helical gear design eliminates the need for wearable parts, resulting in maintenance free traction recognized not only for its toughness, but its smooth and quiet operation as well.Proven design, low cost and effective performance all make the Detroit Truetrac limited slip differential the ideal choice for a wide variety of vehicle applications. No maintenance - Just Traction. Vehicle Usage: Off-Road - Rock Crawl, Work Truck / Towing, Restoration, Extreme Off-Road, Circle Track, Drag Racing, Work Truck / Towing, Light Trail / Sand Sports, Street and Muscle

Review: Works as described, installed in the front dana30 of a 2015 Jeep JKU (4.88 gears)
Review: I picked up the Truetrac for my '04 Jeep Wrangler TJ. I installed one in both front and rear. I'm running stock Dana 30 / 35 axles and didn't want to spend more than twice on lockers for stock axles when I will end up replacing them anyway. This is a fantastic way to make your rig more trail ready while not sacrificing street performance. So far I have had zero issues and unlike other LSD there is zero maintenance besides standard oil changes.

## Features

- Differential Type: Limited Slip (LSD); Gear Spline Tooth Count: 27 EA
- Ring Gear Size: 7.2 IN, Ring Gear Ratio: 3.73 & up
- Axle Description: Dana 30, Wrangler JK ; Axle Location: Front ; Axle Shaft Diameter: 1.16 inches
- Catalog Notes: Applies to non-disconnect only

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001DN9R3E |
| Best Sellers Rank | #114,510 in Automotive ( See Top 100 in Automotive ) #27 in Car Differential Assembly Kits |
| Brand | Eaton |
| Customer Reviews | 4.2 4.2 out of 5 stars (69) |
| Date First Available | 1 January 2024 |
| Exterior | Machined |
| Item Weight | 8.12 Kilograms |
| Item model number | 912A585 |
| Manufacturer | Eaton |
| Manufacturer Part Number | 912A585 |
| Model | Differential |
| Special Features | Durable, Maintenance Free Traction, Smooth Operation |

## Product Details

- **Brand:** Eaton
- **Colour:** Silver
- **Material:** Alloy Steel
- **Product dimensions:** 21.3D x 21.3W x 21.8H centimeters

## Images

![912A585 Detroit Truetrac 27 Spline Differential for Dana 30 - Image 1](https://m.media-amazon.com/images/I/619iMhsHoZL.jpg)

## Questions & Answers

**Q: I ordered this unit for a cj-5 with dana 30 front axle, site says it will fit.  it does not fit! can i get contact information for my mechanic please?**
A: You probably have  a different axle , dana 44 maybe

**Q: I'm planing to install it on my jku 2016 sahara (front dana 30) in replacement of stock open diff. what bearings/shims kit should i use ? thx!**
A: Not the answer your wanting, but in my case they sent the wrong differential but correct box. Everything was back ordered so when I installed diff it was after the 30 days so no return possible, so check.

**Q: Does this kit come with new bearings and crush sleeve?**
A: This kit does not provide any carrier bearings, nor carrier shims, nor pinion bearings, nor pinion shims, nor crush sleeve.

**Q: Does this carrier fit size Yukon Gear Ratio 4.11 dana 30, jeep wrangler yj?**
A: Consult manufacturer before choosing, and be sure you go with the numerically higher version. Believe it is 3.73 and numerically higher version.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by B***F on 3 January 2026*

Works as described, installed in the front dana30 of a 2015 Jeep JKU (4.88 gears)

### ⭐⭐⭐⭐⭐ Review
*by A***H on 1 March 2018*

I picked up the Truetrac for my '04 Jeep Wrangler TJ. I installed one in both front and rear. I'm running stock Dana 30 / 35 axles and didn't want to spend more than twice on lockers for stock axles when I will end up replacing them anyway. This is a fantastic way to make your rig more trail ready while not sacrificing street performance. So far I have had zero issues and unlike other LSD there is zero maintenance besides standard oil changes.

### ⭐⭐⭐⭐⭐ Review
*by A***M on 30 August 2019*

Traditionally, you got to choose between a locker that would chirp your outer tire in turns and wear out your tires or an open diff that will reliably direct all power to the wheel with the least traction. Putting a locker in the front was even worse, sometimes to the point of being outright dangerous. Two solutions emerged: selectable lockers and TorSen differentials. Air and electronic selectable lockers have a place, and while they 're more complicated than a TorSen, offer fully locked performance. If you are likely to have a wheel completely off of the ground with any regularity AND wish to use that vehicle on the pavement, then a selectable locker is the best choice. For the those of us who don't want to install a part that WILL eventually break and will likely stop the vehicle when it does so, the TorSen is a great compromise. A Torque-Sensing differential is essntially an open differential that connects the axles with a worm gear which will force torque to the wheel that is moving faster (i.e. slipping or going around the outer edge of a corner). It will NOT function if the slipping wheel has ZERO resistance (i.e. a wheel suspended in the air while rock climbing), but this issue can be overcome to a limited extent by tapping the brake (i.e. using the brake disc to a apply just enough resistance to the slipping wheel to engage the differential). The benefit is that you can easily put them on the front and rear with no perceptible change in handling (i.e. what the US military did with the HMMV), while the system is a closed purely mechanical system with no clutches. For an on/off road vehicle, that isn't going to be rock-climbing, there isn't a better system.

## Frequently Bought Together

- Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30
- Yukon Gear & Axle - Gear & Install Kit for Jeep JK non-Rubicon 4.88 Ratio - includes ring and pinion (4.88 ratio) - YGK013
- Eaton 913A589 Detroit Truetrac Rear 30 Spline Differential for Dana 44

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-27*