SKU: 129-2503 | UPC: 672036046835
ARP GM Duramax 6.6L Harmonic Balancer Bolt Kit 2001-2016 Chevy GMC HD Trucks
ARP 129-2503 Harmonic Balancer Bolt Kit replaces the factory bolt on GM Duramax 6.6L diesel engines in 2001-2016 Chevrolet Silverado GMC Sierra heavy-duty trucks and vans. This kit prevents balancer slippage and failure in tuned high-horsepower applications with stock harmonic balancers. Engine builders rely on it for secure crankshaft-to-balancer attachment during extreme drag racing and towing.
Key Features
- ARP2000 Alloy Construction: Forged from high-tensile 8740 chromoly steel with over 220,000 psi strength to withstand 1000+ hp builds.
- Complete Kit Contents: Includes one M16 x 140mm main bolt one 12-point head nut and heavy-duty washer for full replacement.
- High Torque Rating: Rated for 300 ft-lbs dry or 340 ft-lbs wet torque far beyond OEM specs for rock-solid hold.
- Precision Machined Threads: Perfect fit into crankshaft nose eliminates cross-threading and ensures even clamping load.
- Direct OEM Replacement: Bolts in without modifications maintains stock balancer alignment and timing.
Product Notes
- Use ARP Ultra-Torque assembly lube on threads and under nut for accurate torque.
- Inspect harmonic balancer condition before installation replace if worn.
- Compact packaging allows fast shipping worldwide.
Installation Notes
- Professional installation recommended.
- Remove OEM bolt with impact tool torque new ARP bolt to 300-340 ft-lbs based on lubrication.
- Compatible with stock or aftermarket harmonic balancers no special tools needed beyond 12-point socket.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2001-2016 | Chevrolet | Silverado 2500 HD | 6.6L Duramax Diesel |
| 2001-2016 | Chevrolet | Silverado 3500 HD | 6.6L Duramax Diesel |
| 2001-2016 | GMC | Sierra 2500 HD | 6.6L Duramax Diesel |
| 2001-2016 | GMC | Sierra 3500 HD | 6.6L Duramax Diesel |
| 2006-2016 | Chevrolet | Express 3500 | 6.6L Duramax Diesel |
| 2006-2016 | GMC | Savana 3500 | 6.6L Duramax Diesel |
Why Choose ARP?
- Proven in NHRA Top Fuel and Pro Stock engines for decades.
- Every fastener exceeds SAE and military specs for durability.
- Custom heat treatment process delivers consistent performance.
Frequently Asked Questions
- Q: Will this fit my 2011-2016 LML Duramax Silverado?
A: Yes ARP 129-2503 fits all 2001-2016 GM 6.6L Duramax LB7 LLY LBZ LMM LML engines in trucks and vans. - Q: What material and finish does the bolt have?
A: Made from ARP2000 alloy 8740 chromoly with black oxide finish for corrosion resistance and precise torque. - Q: What is the warranty and torque procedure?
A: ARP provides limited lifetime warranty against manufacturing defects torque to 300 ft-lbs dry or 340 ft-lbs with moly lube in three steps.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Secure padded envelope 5 x 4 x 1 inches
- Weight: 0.25 lb
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