Eaton
Eaton Master Differential Installation Kit GM 8.5/8.6 Inch 10-Bolt Rear - K-GM8.5-08R
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:
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Complete installation kit for GM 8.5"/8.6" 10-bolt rear axles
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Includes premium Timken bearings for proven reliability
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All required hardware and setup tools included—no guesswork needed
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Fits Eaton Detroit Locker, Truetrac, and ELocker applications
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Ideal for rebuilding or upgrading existing differential setups
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Standard rotation configuration with all essential components supplied
Specifications:
| 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:
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187C148A
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913A481
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19559-010
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19659-010