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The Eaton Detroit Truetrac Differential (Part #913A561) is a premium limited-slip differential designed for Ford 8.8-inch axles with 31-spline shafts. Built for superior traction and durability, the Detroit Truetrac is Eaton’s helical-gear style LSD—offering smooth, automatic torque biasing without clutches or friction plates. Ideal for both on-road performance and off-road strength, it delivers consistent, maintenance-free operation across a wide range of driving conditions. Whether it’s for drag racing, towing, or rock crawling, this differential ensures maximum traction and control where you need it most.
Helical-gear limited-slip design for smooth, automatic torque transfer
Maintenance-free—no clutches or friction materials to wear out
Durable forged steel construction for long-lasting performance
Proven design trusted in both high-performance and heavy-duty applications
Engineered for Ford 8.8-inch, 31-spline axle setups
Works with all gear ratios
| Attribute | Details |
|---|---|
| Brand | Eaton |
| Product Type | Detroit Truetrac Differential |
| Part Number | 913A561 |
| Differential Type | Limited Slip (LSD) |
| Axle Type | Ford 8.8 in |
| Spline Count | 31 |
| Axle Shaft Diameter | 1.32 in |
| Ring Gear Ratio | All |
| Ring Gear Size | 8.8 in |
| Product Weight | 25.25 lb |
| Model Years | Vehicle Make | Vehicle Type / Model | Axle Location | Axle Description | Gear Ratio |
|---|---|---|---|---|---|
| 1986–2014 | Ford, Lincoln, Mercury | Passenger Car | Rear | Ford C-Clip | All |
| 1983–2014 | Ford | Small Truck, Minivan, SUV | Rear | Ford C-Clip | All |
| 1987–2014 | Ford | Half-Ton Truck, Van, SUV | Rear | Ford C-Clip | All |
On Road: Drag Racing, Restoration, Circle Track, Work Truck/Towing, Street & Muscle
Off-Road: Light Trail/Sand Sports, Rock Crawl, Extreme Off-Road, Work Truck/Towing
We are open Monday-Friday from 8am-6pm EST
Yes, customers located in and around the the Piedmont area are welcome to pick up their items from our retail location during normal business hours. Our address is:
Elite Race Fab
1514 Holbrook St Suite D-F
Greensboro, NC 27403
Elite Race Fab offers free ground shipping & handling to our retail customers within the lower 48 contiguous United States on most orders totaling $159.99 and higher, when the item being purchased is not a Freight/LTL item! Orders under $159.99 will be subject to a nominal $13.99 Flat shipping charge. Some exceptions and/or exclusions apply, in those scenarios you will be advised of any additional charges in the item details/description stating shipping exclussions/freight shipping required etc.
In regards to expedited and international shipping each order will need to be quoted on a case by case basis. You can obtain a quote two ways:
- From your shopping cart select "Request a Quote" prior to placing your order. We will review your proposed order and promptly respond with shipping estimates.
- Complete your order ahead of time indicating either expedited or international shipping during the checkout process. We will promptly determine shipping rates for your order and email you for approval and additional payment.
-Give us a call and we can ensure your item is shipped right then, to ensure you have it in time for your deadline.
We have been committed to offering all of our customers the lowest pricing throughout our website day in and day out. We value your business so much that we go a step further than our competitors. We use a third party software that proactively monitors all our competitor's websites/pricing so that we can make adjustments accordingly if needed to have the lowest prices. Thats right, no need to spend hours searching for the lowest prices, as ours will be the lowest.
As far as price matching, we dont want to write a check we cant cash, but we certainly want to earn your business. With that said, we will go above and beyond to match our competitor's pricing when it is needed. Simply email us, click the live contact button, or give us a call and be sure to have a link to our competitor's site and please factor in any shipping and handling their website will be charging. We will then ensure you get the lowest price, and either match or beat their pricing.
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