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Eaton Detroit TrueTrac Ford 10.25 Inch / 10.5 Inch Rear Differential - 915A550

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  • Eaton | Part Number: EAT915A550
  • Popular Axle Manufacture:Ford
  • Axle Location:Rear
  • Fitment:Universal Fit
  • Axle Type:Ford 10.5 Inches|Ford 10.25 Inches
  • Availability:In Stock
  • Axle Spline:35 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
4 Customer ratings
5.0 Truetrac differential for Ford 10.5

Order was correct and fit as stated. I didn't have to return to the store to get any other parts to make it fit correctly.

from Hurdle Mills, North Carolina |
5.0 has been in truck 16 years

I put this eaton in my truck 16 years ago . The only time you know you have a geared ls is when it has a heavy load. As close to a locker that you can get!

from cen wi |
5.0 TrueTrac '03 F350 superduty 4x4

I did recommend this to a friend. and the front end is next. snow, ice, sand, and dirt. with decent tires, I have no compaints

from San Diego, ca |
5.0 trutrac excursion 2003

the thing works well, no noise at all, both tires spin in the sand. thats all i want. better mod than lift/tires for sure, the front is next, prob same locker

from florida keys |



Question & Answers

5 Answered questions

Q: Will this fit the semi-float Sterling 10.25 used in '97-'99 F-250 Light Dutys, or is it full-float only? Answer this question

A: The Eaton Detroit TrueTrac Ford 10.25 Inch / 10.5 Inch Rear Differential - 915A550 (Full float applications only) 1985 - 2019 Ford

Answered by Dave from 4WP HQ on 12/28/2021

Q: Will this fit a Dana 70 super 4.56 gear from a 2013 E-450 Answer this question

A: No this will not fit you vehicle. Please feel free to call our customer help line at 1-877-474-4821 to give more details about your vehicle and see if we can find a part that fits exactly what you are looking for.

Answered by Chris from Compton. CA on 01/15/2021

Q: Will this fit a 2012 F-150 3.55 rear axle and how would i find out my spline count on the axle shafts i already have or would i have to order new axle shafts to match the differential's spline count? Answer this question

A: Hello This unit is for the the F250/350 your truck would have the 9.75 rear axle. The correct unit is the EAT 913A477 here is a link to it. Thanks

Answered by Rody on 05/17/2015

Q: Will this dif fit my stock 04 f250 XL With the 5.4 Answer this question

A: Hello Yes this is the correct unit for your Ford Sterling rear axle.

Answered by Rody on 09/08/2014

Q: Is there an installation kit with shims and bearings? Answer this question

A: Jeffrodoc G/2 gear has a complete installation kit that includes pinion bearings ,differential bearings, pinion shims, differential shims, crush sleeve and a pinion seal all in one complete kit. there are two kits available. the G/235-2046 for the 86-98 and the G/235-2046A for the 1999 and newer thank you

Answered by Stevie on 10/14/2013


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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