---
product_id: 17296567
title: "Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30"
brand: "eaton"
price: "€ 1270.11"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.hr/products/17296567-eaton-912a585-detroit-truetrac-27-spline-differential-for-dana-30
store_origin: HR
region: Croatia
---

# Optimized for Dana 30 front axle 27 spline gear teeth precision Maintenance-free durable design Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30

**Brand:** eaton
**Price:** € 1270.11
**Availability:** ✅ In Stock

## Summary

> ⚙️ Own the road and the trail with Detroit Truetrac – where power meets precision.

## Quick Answers

- **What is this?** Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30 by eaton
- **How much does it cost?** € 1270.11 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/17296567-eaton-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

- • **Tailored for Dana 30:** Specifically crafted for Wrangler JK front axle, guaranteeing perfect fit and performance.
- • **Precision Engineering:** 27 spline gear teeth ensure robust power transfer and long-lasting durability.
- • **Quiet & Smooth Operation:** Experience whisper-quiet performance without sacrificing toughness or traction.
- • **Unmatched Traction Reliability:** Helical gear LSD design delivers smooth, maintenance-free grip in any terrain.
- • **Versatile Off-Road & On-Road Use:** From rock crawling to street muscle, this differential adapts seamlessly to your driving style.

## Overview

The Eaton 912A585 Detroit Truetrac is a pioneering helical gear limited slip differential designed for Dana 30 front axles, featuring 27 spline gear teeth and a 3.73+ ring gear ratio. Renowned for its maintenance-free, durable traction and smooth, quiet operation, it excels in diverse applications from extreme off-road rock crawling to street muscle cars, making it the go-to upgrade for serious drivers seeking reliable, high-performance drivetrain enhancement.

## 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

## 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 |
|---------------|-------|
| Brand | Eaton |
| Color | Silver |
| Recommended Uses For Product | Off-Road: Rock Crawling, Work Truck / Towing, Extreme Off-Road, Light Trail / Sand Sports, Circle Track, Drag Racing On Road: Restoration, Street and Muscle, Work Truck / Towing |
| Product Dimensions | 8.4"D x 8.4"W x 8.6"H |
| Special Feature | Durable, maintenance-free traction, smooth operation |
| Mounting Type | Freestanding |
| Room Type | Living Room |
| Door Style | Flat Panel |
| Included Components | Differential |
| Finish Type | Powder Coated |
| Size | Klein |
| Item Weight | 17.9 Pounds |
| Base Type | Legs |
| Installation Type | Freestanding |
| Top Material Type | Steel |
| Handle Material | Alloy Steel |
| Back Material Type | Alloy Steel |
| Assembly Required | No |
| Frame Material | Alloy Steel |
| Is Customizable | No |
| Global Trade Identification Number | 00804314213992 |
| Hardware Color | Silver |
| Assembly Instructions Description | Included |
| Model Name | Differential |
| UPC | 804314213992 |
| Manufacturer | Eaton |
| Item Weight | 17.9 pounds |
| Item model number | 912A585 |
| Is Discontinued By Manufacturer | No |
| Exterior | Machined |
| Manufacturer Part Number | 912A585 |
| Special Features | Durable, maintenance-free traction, smooth operation |

## Product Details

- **Brand:** Eaton
- **Color:** Silver
- **Recommended Uses For Product:** Off-Road: Rock Crawling, Work Truck / Towing, Extreme Off-Road, Light Trail / Sand Sports, Circle Track, Drag Racing On Road: Restoration, Street and Muscle, Work Truck / Towing
- **Product Dimensions:** 8.4"D x 8.4"W x 8.6"H
- **Special Feature:** Durable, maintenance-free traction, smooth operation

## Images

![Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30 - Image 1](https://m.media-amazon.com/images/I/619iMhsHoZL.jpg)
![Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30 - Image 2](https://m.media-amazon.com/images/I/21ZXc9SSuoL.jpg)
![Eaton 912A585 Detroit Truetrac 27 Spline Differential for Dana 30 - Image 3](https://m.media-amazon.com/images/I/31LMDWYQp9L.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

### ⭐⭐⭐⭐⭐ You Won't Know That It's There
*by A***M on August 30, 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.

### ⭐⭐⭐⭐⭐ Good products. Great service
*by C***T on May 15, 2020*

Cant beat an Eaton , great little upgrade . Get a install kit when you install go to install it. .

### ⭐⭐⭐⭐⭐ Works great.
*by J***M on April 16, 2019*

I added this differential to the front dana 30 on my 1974 CJ5. The differential allows very little slip when both tires are on the ground, and works extremely well. If you lift one of the tires in the air the differential will not send power to the tire on the ground, so in that sense it is not as effective as a true locker. This is a great option for a front axle like a dana 30 where a true locker may add too much stress to the stock parts.

## 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 Croatia*
*Store origin: HR*
*Last updated: 2026-02-07*