Eaton Detroit TrueTrac Dana 44 30 Spline 3.73 Down Rear Differential - 913A589

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  • Eaton | Part Number: EAT913A589
  • Popular Axle Manufacture:Dana
  • Axle Location:Rear
  • Fitment:Universal Fit
  • Axle Type:Dana 44
  • Availability:In Stock
  • 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
7 Customer ratings
5.0 As advertised

Perfect conversion to posi at an affordable price, easy installation

from Townsend |
5.0 Eaton Upgraded True Trac

Perfect snug fit. Got the True Trac limited slip. Works perfectly. My best advice is use the race to slide into housing. What I found is taking the race a placing it on edge of housing while simultaneously putting carrier bearing inside the race and pushing it in while turning race too. She will slide in.

from Louisiana |
5.0 Awesome traction.

Awesome traction for a daily driver the goes on trails as well.

from Iowa |
5.0 Eaton Detroit TrueTrac Dana 44 30 Spline 3.73 Down

Worry Free mechanical locker. Noiseless and always working. When power is applied, the wheels are locked.

from Arizona |

Easy install, Perfect fit, Nice and quiet.

from Fayetteville |



Question & Answers

20 Answered questions

Q: WIll this work on 2021 Bronco 3.73 open rear diff ? (M220 Dana 44) Answer this question

A: Sierra496 sounds like an insecure jeep b!tch lol

Answered by jeepgay from north pole on 12/05/2022

A: I am a Jeep driver, how would I know or care if it fit's a wanna be Jeep, (Bronco)

Answered by Sierra496 from Seattle Wa. on 06/07/2022

Q: Will this fit a 2001 Jeep TJ rear DANA 44 with 4.56 gears? Please don’t respond with “ This carrier is for 3.73 and down gear ratios” if I was confident with what that means I would not be asking this question. Answer this question

A: This LSD can work with 4.56 gears but you need to order 4.56 THICK to work with 3.73 down carrier. If you already bought 4.56 non thick then the part number below as stated is recommended for 3.92 and up. 

Answered by Chris from Louisiana on 09/10/2022

A: Please use PN: EAT913A590 Eaton Detroit TrueTrac Dana 44 30 Spline 3.92 UP Rear Differential

Answered by Dave from 4WP HQ on 02/21/2022

Q: Is Truetrac LSD good for drifting? Mainly will be offroad drifting though, Thanks  Answer this question

A: Limit Slip Differentials will give you 30% traction to the wheel on the ground and 70% goes to the wheel in the air. Lockers give 100% to both wheels when engaged or Selectable Lockers can be turned off.

Answered by Dave from 4WP HQ on 08/25/2023

Q: 2012 jeep JK, will this cause problems with the vehicle stabilization? Answer this question

A: I have a Truetrac in my front and rear JK differentials and it is unstoppable in snow, mud and great on the street.  No issues with stabilization at all

Answered by Mark S from California on 10/09/2022

Q: What Carrier Bearings set (outer) should I order with this? 2013 Jeep JKU, Dana 44, 30 Spline, 3.73 Ratio (Replacing factory Trac-Lok limitted slip) Answer this question

A: Please use 2each TIM25590 carrier bearings and 2 each TIM25523 carrier races. These are the same as the stock carrier bearings on a non Rubicon JK Rear end. The Trutrac does not change the carrier bearing requirement.

Answered by Kelly from 4WP Corporate Headquarters on 07/21/2021


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


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