Eaton Detroit TrueTrac Dana 44 30 Spline 3.92 UP Rear Differential - 913A590 |

Eaton Detroit TrueTrac Dana 44 30 Spline 3.92 UP Rear Differential - 913A590

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  • Eaton | Part Number: EAT913A590
  • Popular Axle Manufacture:Dana
  • Axle Location:Rear
  • Axle Type:Dana 44
  • Fitment:Universal Fit
  • Axle Spline:30 Splines
  • Differential Type:Limited Slip Assembly


The Detroit TrueTrac Limited Slip is an all gear driven clutchless differential. The TrueTrac will automatically provide smooth transfer of power from the slipping wheel to the non slipping wheel to help you out of a jam. With no clutches to wear out, you will have a dependable long lasting Limited Slip differential.

Customer Reviews

5.0 5.0
2 Customer ratings

Customer Images

5.0 JK rear locker

Excellent component.... Fantastic service.... Great value

from Jacksonville, FL |
5.0 Quick & easy

Quick & easy to change , works fine on the street, will try it out on the ro ks this weekend




Question & Answers

7 Answered questions

Q: I tried to install this with my 4.56 gears, and it would not fit. Ring was too far over right. Do I need to get non-thick gears? My original gear was 3.73, and the 4.56s installed just fine. My Jeep is a 2013 Sport. Gears I have are from USA Standard Gear Answer this question

A: All JK rear Dana 44 Ring and Pinions are THICK gears. They must be installed on a 3.73 and numerically lower carrier regardless of the ratio being installed. You should have bought EAT913A589. The EAT913A590 is incorrect for the JK rear.

Answered by Kelly from 4WP Corporate Headquarters on 01/12/2021

Q: Hi, I own a 2014 wrangler sport, I currently have the oem open differential with 3.21 gearing. Is this differential correct for my application. thanks Answer this question

A: Thanks for the inquiry jkjesse, the Detroit Locker Dana 44 30 Spline 3.92 UP Rear TrueTrac part # EAT913A590 is incorrect , you'll need part # EAT913A589.( DOES NOT WORK WITH RUBICON MODELS)

Answered by RK on 10/06/2015

Q: I have a 2006 Wrangler Unlimited with a Dana 44 in the rear and the factory limited slip. I want to regear to 4.56's. Will this fit and what master overhaul kit will I need to install this? Answer this question

A: Hello AJ Yes this will work in your LJ with 456 gears. install kit is G/2 35-2033 gears G/2 2-2033-456 or D/S 706017-21x install kit included. Thanks

Answered by Rody on 08/29/2015

Q: I'm installing 4.11 gears. Will this fit in my 2014 Jeep JK 2-door Sport with the 4.11's? Answer this question

A: Hello All of the JK rear gears are thick gears and go on the 373 and down carrier. the part number is EAT 187sl16d Thanks

Answered by Rody on 06/25/2015

Q: Will this work with my 2009 Jeep Wrangler unlimited with 5.13 gears in a rear dana 44. Answer this question

A: Austin, unfortunately this locker will not work as you need the 3.73 and down part#913a589 all JKs have thick gears in the rear and cant run thin gears either. Hope this helps thanks for the question.

Answered by RK on 04/02/2015


The Eaton Corporation has enjoyed over a century of innovation and is in the business of powering Jeeps with a top-rate lineup of lockers, open differentials and limited slips. Traction performance is critical while jeeping and we carry Eaton components for upgrading vehicle traction. Compatible with different axle splines and various gears, these parts are often rebuildable and are top performers on and off-road. Eaton's rich tradition of engineering innovative, dependable products extends to off-road parts and accessories for 4x4s and they have evolved to become the industry standard in differentials, lockers and limited slips. Shop Eaton Now