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Eaton Detroit Locker Dana 30 27 Spline 3.73 Up Front TrueTrac - 912A585

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  • Eaton | Part Number: EAT912A585
  • Popular Axle Manufacture:Dana
  • Fitment:Universal Fit
  • In_Stock:In Stock
  • In_Stock:In Stock
  • Axle Spline:27 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.



Excellent choice.

This is the best choice for an front axle installation. Great improvment in offroad tractions combined with daily road use. This is what I call value for money.

from Norway. |

Question & Answers

7 Answered questions

Hi 4wd, I have a 99 Cherokee Sport XJ with stock 3:55 gears. Front Axle: Dana 30 High Pinion (Reverse) Rear Axle: Chrysler 8.25 I am looking to upgrade from my 3:55's to 4:10's, and add TrueTrac front and rear. 1) Is this the correct TrueTrac product for my front axle and expected 4:10 gear setup? 2) I have been reading that upgrading my front axle D30 HP from 3:55 to 4:10 requires purchasing a separate low ratio carrier. Do I still need this additional carrier if I am installing the TrueTrac or does the TrueTrac act as the new carrier? Thanks!

Asked by Aaron from United States on

Hi Aaron The Dana 30 TrueTrac takes the place of the stock carrier on the front axle and this is the correct part number for the front axle. Thanks

Answered by LWiff ext 4804 from United States on

Hello, would this fit on a 2005 Jeep Liberty front differential, thank you

Asked by John from Miami fl on

Hi John, This Detroit Locker Dana 30 27 Spline 3.73 Up Front True Trac is the correct front locker for the Jeep's with a Dana 30 front axle, 3.73 ratio and higher. Thanks for your inquiry.

Answered by Jim G Ext 4806 from Miami fl on

I am fixing to buy your 4.56 kit for my 2010 wrangler it has on the door sticker a new improved dana 30 front and dana 44 rear will this fit the front dana30 for this year and what does new and improved mean on the dealer tag

Asked by CHARLIE iam a jeeper from palestine,tx on

Charlie, the Detroit Locker Dana 30 27 Spline 3.73 Up Front TrueTrac will fit your Jeep just fine. The "new" Dana 30 is referring to the Dana 30 that is in the 2007-up JK's vs the old Wrangler Dana 30's. I hope this helps.

Answered by Sara H. Ext 4874 from palestine,tx on

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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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