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The Jeep Wrangler is a favorite among off-road enthusiasts, and the HEMI engine swap has become a popular choice for those looking to boost performance. When considering a HEMI swap, one of the most critical decisions is selecting the right transmission. Two of the most talked-about options are the 8HP70 and the 8HP90. This article will explore the differences, advantages, and considerations for each transmission when paired with a Wrangler HEMI swap.
Overview of the 8HP70 and 8HP90 Transmissions
Both the 8HP70 and 8HP90 are part of the ZF 8-speed automatic transmission family. They are known for their smooth shifting capabilities and efficiency. However, they cater to different performance needs and vehicle applications.
8HP70 Transmission
The 8HP70 is designed for lighter applications and offers a balance of performance and efficiency. It is commonly found in vehicles like the Jeep Grand Cherokee and Dodge Charger.
- Torque Capacity: Up to 650 lb-ft.
- Weight: Approximately 200 lbs.
- Gear Ratios: 4.71:1 to 0.64:1.
8HP90 Transmission
The 8HP90, on the other hand, is built for higher performance and is typically used in more powerful vehicles like the Dodge Hellcat. It can handle more torque and is ideal for those looking to maximize the potential of their HEMI swap.
- Torque Capacity: Up to 800 lb-ft.
- Weight: Approximately 220 lbs.
- Gear Ratios: 4.71:1 to 0.64:1.
Comparing Performance and Features
When choosing between the 8HP70 and 8HP90 for a Wrangler HEMI swap, it’s essential to consider performance, features, and compatibility.
Performance
The 8HP90 offers superior performance due to its higher torque capacity, making it a better choice for more powerful HEMI engines. If you’re planning to push the limits of your Wrangler, the 8HP90 may be worth the investment.
Features
Both transmissions come with advanced features, including:
- Adaptive transmission control for smooth shifting.
- Multiple driving modes for different terrains.
- Integrated electronic control for precise performance.
Installation Considerations
Installing either transmission in a Wrangler requires careful planning. Here are some considerations to keep in mind:
- Transmission Mounting: Ensure proper mounting brackets are in place.
- Drivetrain Compatibility: Check compatibility with the transfer case and driveshaft.
- Wiring and Electronics: Properly integrate the transmission control module.
Cost Analysis
The cost of the transmission is an important factor in your decision. Generally, the 8HP90 is more expensive than the 8HP70. Consider the following:
- 8HP70: Typically ranges from $3,000 to $4,000.
- 8HP90: Typically ranges from $4,500 to $6,000.
Conclusion
Choosing between the 8HP70 and 8HP90 for your Wrangler HEMI swap depends on your performance goals, budget, and installation considerations. For those seeking a balance of performance and cost, the 8HP70 is a solid choice. However, if you aim for maximum power and capability, the 8HP90 will provide the performance you need. Evaluate your specific requirements and make an informed decision to enhance your Wrangler’s capabilities.