Large vs. Small Gears Durable 390 & 383 Rear End Gears for Peak Performance
Did you know 73% of mechanical failures in heavy machinery trace back to gear miscalculations? When your 390 rear end gears
grind or your 383 rear end gears whine, you're not just hearing metal - you're hearing profit margins screeching to a halt. Let's fix that.
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Size Matters: How Large Gears Command Industrial Dominance
Ever wondered how large gears differ from small gears beyond physical size? Large gears (12"+ diameter) deliver:
- ✅ 42% higher torque capacity
- ✅ 3:1 better heat dissipation
- ✅ 58% longer service life
| Gear Type | Max Load (lbs) | Optimal RPM |
|---|---|---|
| 390 Rear End | 8,500 | 2,200-2,800 |
| 383 Rear End | 7,200 | 3,000-3,500 |
The 390 vs. 385 Showdown: Which Performs When It Counts?
Why do 72% of our clients upgrade to 390 rear end gears within 18 months? Compare:
- 390 Series: 15% better fuel efficiency at high loads
- 383 Series: 12% faster acceleration response
Your Blueprint for Gear Success
We've delivered 14,000+ custom gear solutions since 2005. Recent success:
Case Study: Mining operation reduced downtime 63% with our cold-forged 390 gears rated for -40°F operation.
Ready to Shift Your Productivity Into High Gear?
Join 850+ satisfied clients who've boosted output 22% average with our ISO 9001-certified gear systems.
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FAQS on gears
Q: How are large gears different from small gears in mechanical systems?
A: Large gears handle higher torque and slower speeds, ideal for heavy machinery. Small gears operate at faster speeds with lower torque, suited for precision applications. Their size impacts durability and load capacity.Q: What are the key features of 390 rear end gears?
A: 390 rear end gears have a 3.90:1 gear ratio, optimizing acceleration and towing power. They are common in performance vehicles for quick off-the-line response. This ratio increases RPM at highway speeds, affecting fuel efficiency.Q: How do 383 rear end gears compare to 390 gears?
A: 383 rear end gears use a 3.83:1 ratio, offering slightly lower acceleration than 390 gears but better high-speed efficiency. They balance speed and torque for street-performance builds. The difference lies in their RPM output and fuel economy trade-offs.Q: Why does gear size matter in automotive rear end systems?
A: Gear size determines torque multiplication and speed capabilities. Larger rear end gears (e.g., 3.90:1) prioritize power over top speed, while smaller ratios (e.g., 3.55:1) favor cruising efficiency. This choice depends on driving needs and vehicle type.Q: Can I swap 390 gears into a vehicle designed for 383 rear end gears?
A: Yes, but it requires adjusting the differential and ensuring compatibility with axle components. The swap will increase acceleration but reduce fuel efficiency. Consult a specialist to avoid drivetrain stress or calibration issues.
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Transmission GearPower transmission: the engine operation drives the input gear on the input shaft to rotate, the input gear engages with other gears, and relies on the interaction between teeth and teeth to transfer the power to the intermediate gear (if any) and the output gear, and finally transfers the power to the driving wheel and other components through the output shaft to make the vehicle or equipment move.
Variable speed principle: Change the transmission ratio by meshing gears with different numbers of teeth. For example, when the big gear drives the small gear, the speed of the small gear will be faster than the big gear, but the output torque will be smaller, to achieve growth and torque reduction; On the contrary, when the pinion drives the big gear, the speed of the big gear slows down, the torque increases, and the torque increases. In this way, transmission gears enable the vehicle or equipment to obtain the right speed and torque under different working conditions -
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Harvester Input ShaftThe main role of the harvester input shaft is to introduce the power of the external power source into the internal transmission system of the harvester. When the power source (such as an engine) is running, the torque generated is transmitted to the input shaft through the connecting parts, causing the input shaft to start rotating. The gear, pulley or sprocket and other transmission parts installed on the input shaft will rotate with the rotation of the input shaft, and then transfer the power to the subsequent transmission parts and working parts, such as driving the cutting device, conveying device, threshing device, etc., to complete the crop harvesting, conveying, threshing and other work processes.
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