Speak with an Expert
Speak with an Expert
Free* Shipping on Orders Over $159
Easy 30 Days- No Hassle Returns
37,000+ 5 Star Reviews
MFG Fitment Guarantee
Couldn't load pickup availability
The Eaton Master Differential Installation Kit (Part #K-GM8.5-08R) provides everything you need for a complete and precise differential rebuild or installation on GM 8.5"/8.6" 10-bolt rear axles. Engineered to Eaton’s exacting standards, this master kit includes premium Timken bearings, seals, shims, and hardware—ensuring reliable performance and long-term durability.
Designed for both professional mechanics and experienced DIY installers, this comprehensive kit simplifies installation of Eaton differentials such as the Detroit Locker, Truetrac, and ELocker. It includes all critical setup components, from bearings to marking compound, to ensure a perfect gear mesh and trouble-free assembly.
Features:
Complete installation kit for GM 8.5"/8.6" 10-bolt rear axles
Includes premium Timken bearings for proven reliability
All required hardware and setup tools included—no guesswork needed
Fits Eaton Detroit Locker, Truetrac, and ELocker applications
Ideal for rebuilding or upgrading existing differential setups
Standard rotation configuration with all essential components supplied
| Specification | Detail |
|---|---|
| Part Number | K-GM8.5-08R |
| Product Type | Master Differential Installation Kit |
| Axle Model | GM 8.5" / 8.6" 10-Bolt (C-Clip) |
| Axle Spline Count | 30 |
| Cover Bolts | 10 |
| Ring Gear Bolts | 10 |
| Ring Gear Rotation | Standard |
| Carrier Shims Included | Yes |
| Ring Gear Bolts Included | Yes |
| Head Bearing Included | Yes |
| Tail Bearing Included | Yes |
| Carrier Bearings Included | Yes |
| Bearing Brand | Timken |
| Thread Locking Compound | Included |
| Gear Marking Compound | Included |
| Weight | 6 lb |
| UPC | 840379326390 |
Fitment:
Designed for GM 8.5"/8.6" 10-bolt rear axles (C-Clip type). Compatible with the following Eaton differential part numbers:
187C148A
913A481
19559-010
19659-010
