g35 automatic to manual swap
The G35 automatic to manual transmission swap is a complex yet rewarding modification, offering enhanced performance and driver engagement. It requires careful planning and significant investment but delivers a more immersive driving experience.
1.1 Overview of the G35 and Transmission Swap
The Infiniti G35, known for its powerful V6 engine and smooth automatic transmission, has garnered attention for its potential to become even more dynamic with a manual transmission swap. This modification involves replacing the automatic gearbox with a manual unit, often sourced from compatible models like the Nissan 350Z or Skyline. The swap aims to enhance driver engagement, improve performance, and offer better control over the vehicle. While the process is complex, it transforms the G35 into a more responsive and thrilling driver’s car.
1.2 Importance of the Swap for Performance
A manual transmission swap significantly enhances the G35’s performance by improving driver engagement, acceleration response, and control. It eliminates the torque converter lag of the automatic, offering crisp shifts and direct power delivery. This modification is particularly beneficial for enthusiasts seeking a more dynamic and responsive driving experience, making it ideal for spirited driving or track use.
Parts Needed for the Swap
The essential components include a manual transmission, clutch kit, clutch pedal assembly, transmission mounts, and shifter with linkage. These parts ensure a smooth and functional conversion.
2.1 Manual Transmission Options
The Nissan 350Z 6-speed manual transmission (JK40A or CD009) is a popular choice for the G35 swap due to its compatibility and robust design. This transmission offers precise gear ratios and durability, making it ideal for performance driving. Ensure the unit is inspected and tested for functionality before installation to guarantee reliability and smooth operation post-swap.
2.2 Clutch Kit and Components
A complete clutch kit is essential for the swap, including a clutch disc, pressure plate, and bearing. The clutch master cylinder and slave cylinder must be installed to engage and disengage the clutch smoothly. A lightweight flywheel is often recommended for better performance. Ensure all components are compatible with the manual transmission and engine specifications for optimal functionality and reliability during operation.
2.3 Clutch Pedal Assembly
The clutch pedal assembly must be installed to replace the automatic pedal setup. This includes the pedal itself, pivot pin, and linkage. A used or aftermarket assembly can be sourced, ensuring compatibility with the manual transmission. The interlock switch, often included, prevents starting without the clutch pressed; Proper installation and adjustment are critical for smooth operation and driver safety. This component is essential for integrating the manual transmission system effectively.
2.4 Transmission Mounts
Transmission mounts are essential for securing the manual transmission and insulating vibrations. They must be compatible with both the engine and chassis. High-quality mounts are recommended to prevent failure and ensure reliability. Aftermarket options are available for enhanced performance or durability, offering improved stability and reduced noise. Proper installation is crucial to maintain alignment and prevent damage to the transmission and surrounding components.
2.5 Shifter and Linkage
The shifter and linkage are critical components for manual transmission operation, enabling precise gear selection. The shifter assembly must be compatible with the manual transmission and properly aligned. Adjustable shifters can improve driver ergonomics, while high-performance linkages enhance shifting accuracy. Installation requires careful alignment to ensure smooth, precise gear engagement. Proper fitment is essential to avoid mechanical issues and maintain optimal performance.
Transmission Swap Process
The transmission swap involves removing the automatic transmission, installing the manual unit, connecting the shifter and linkage, and bleeding the clutch system for proper engagement.
3.1 Removing the Automatic Transmission
Begin by disconnecting the battery to prevent electrical issues. Drain the transmission fluid and disconnect the shifter and linkages. Remove the driveshaft for better access. Detach the torque converter using a specialized tool and unbolt the transmission from the engine. Carefully lift the transmission out, ensuring proper support with a jack to avoid damage or injury.
3.2 Installing the Manual Transmission
Mount the manual transmission by aligning it with the engine’s bellhousing. Secure it using the provided bolts, ensuring proper torque specifications. Replace the torque converter with a clutch assembly, making sure it is centered and properly seated. Reattach the driveshaft, followed by the shifter and linkage components. Double-check all connections for tightness and alignment to prevent future mechanical issues. Precision is key during this step to ensure smooth operation.
3.3 Connecting the Shifter and Linkage
Install the shifter assembly into the center console, ensuring proper alignment and secure fastening. Connect the shifter linkage to the manual transmission’s gear selector. Adjust the linkage for smooth, precise gear engagement. Verify that all connections are tight and properly aligned to avoid any mechanical binding or misalignment. This step is crucial for maintaining accurate gear shifts and optimal transmission performance. Professional guidance is recommended for complex adjustments.
3.4 Bleeding the Clutch System
Bleeding the clutch system ensures proper hydraulic connection between the clutch pedal and the clutch master cylinder. Use a pressure bleeder or manual bleeding kit to remove air from the system. Start by pumping the pedal several times, then hold it down while bleeding. Repeat until fluid flows freely without bubbles. This step is critical for achieving a smooth, responsive clutch operation and preventing spongy pedal feel.
Cost Considerations
The G35 manual swap can range from $700 to several thousand dollars, depending on parts quality, labor costs, and whether you opt for DIY or professional installation.
4.1 Budgeting for Parts
Budgeting for a G35 automatic to manual swap requires careful planning. Parts costs vary widely, with manual transmissions ranging from $500 to $2,000, depending on condition and source. A clutch kit, including the clutch disc, pressure plate, and bearing, typically costs between $300 and $600. The clutch pedal assembly, transmission mounts, and shifter linkage add another $200 to $500. Used parts can significantly lower costs, while new components increase the budget. Plan accordingly to avoid overspending.
4.2 Labor Costs and Professional Installation
Labor costs for a G35 automatic to manual swap can range from $1,000 to $2,000, depending on the shop and complexity. Professional installation ensures expertise, minimizing risks. DIY projects save labor costs but require mechanical skills and tools. Weighing the benefits of professional work against potential DIY challenges is crucial for a successful swap.
4.3 DIY vs. Professional Debate
The DIY approach saves money but demands mechanical expertise and time, while professional installation offers reliability but at a higher cost; DIY enthusiasts can source used parts cheaply but face complex challenges like wiring and fitment issues. Professionals ensure a seamless, OEM-like swap but charge significantly for labor. Weighing personal skills, time, and budget is key to deciding the best route for a successful G35 manual swap.
Potential Challenges and Solutions
Common issues include starter motor fitment, driveshaft length, and wiring adjustments. Solutions involve custom fabrication, adapter kits, and electrical modifications to ensure proper functionality and compatibility.
5.1 Compatibility Issues
Compatibility issues arise when swapping an automatic to a manual transmission in the G35. The starter motor may not fit properly, and the driveshaft length could be incorrect. Additionally, the transmission mounts and crossmember may need modification to accommodate the manual gearbox. These issues can be resolved with adapter kits or custom fabrication to ensure proper alignment and functionality of all components.
5.2 Wiring and Electrical Adjustments
Wiring adjustments are essential when performing a G35 automatic to manual swap. The clutch interlock switch must be integrated to ensure the car starts only when the clutch is pressed. Additionally, the neutral safety switch may need reconfiguration to function correctly with the manual transmission. Proper wiring modifications are critical to avoid electrical issues and ensure smooth operation of the manual gearbox and related components.
5.3 Mechanical Fitment Problems
Mechanical fitment issues often arise during a G35 automatic to manual swap. The transmission mount may not align properly with the manual gearbox, requiring custom or aftermarket mounts. Additionally, the driveshaft length can differ, potentially causing misalignment and vibration. The starter motor may also need adjustment to fit the manual transmission’s bellhousing. These challenges stem from design differences between automatic and manual transmissions, necessitating precise modifications for proper installation and functionality.
Wiring Modifications
Wiring modifications are essential for the G35 automatic to manual swap, primarily involving the clutch interlock switch and neutral safety switch to ensure proper functionality and safety.
6.1 Clutch Interlock Switch Wiring
The clutch interlock switch wiring ensures the vehicle starts only when the clutch is pressed, preventing accidental starts. Connect a 12V power source to Terminal 53 (Grey/Red wire) on the IPDM. This modification is crucial for safety and proper functionality. If using a used clutch pedal, the interlock switch should be included. Correct wiring is essential to avoid electrical issues; consult a professional if unsure.
6.2 Neutral Safety Switch Adjustment
The Neutral Safety Switch (NSS) must be adjusted to recognize the manual transmission’s neutral position. This ensures the starter motor engages only when the clutch is pressed. Improper adjustment can prevent the car from starting or cause unintended starts. Align the NSS with the manual transmission’s neutral position and secure it properly. Consult a professional if unsure to avoid electrical or starting issues.
Troubleshooting Common Issues
Troubleshooting is crucial for a smooth manual swap. Common issues include starter motor fitment, driveshaft length, and wiring problems. Addressing these early ensures reliability and performance.
7.1 Solving Starter Motor Fitment Issues
Starter motor fitment issues are common in G35 manual swaps due to differences in transmission configurations. Ensure compatibility by checking the specific transmission model and G35 year. Look for adapter kits designed for your setup, as they often include necessary spacers or brackets. If no kit is available, consider custom fabrication, which may require professional assistance. Always verify wiring connections to ensure proper functionality and consult community forums for proven solutions. Detailed research and precise adjustments are crucial for a seamless swap.
7.2 Addressing Driveshaft Length Problems
Driveshaft length discrepancies often arise when swapping from automatic to manual transmissions. Measure the existing driveshaft and compare it to the manual transmission’s requirements. If the driveshaft is too short or long, consider purchasing a custom or adjustable unit designed for your G35’s manual setup. Ensure compatibility with both the transmission and differential. Proper installation and alignment are critical to avoid vibration and damage. Always verify measurements before ordering or fabricating a new driveshaft.
DIY vs. Professional Installation
DIY swaps save costs but demand mechanical expertise and time, while professional installations ensure reliability and warranty, though at a higher expense. Choose based on your skill level.
8.1 Tools and Expertise Required
A manual transmission swap demands specialized tools like a flywheel puller, dial indicator, and transmission jack. Mechanical aptitude is crucial, with experience in clutch systems, wiring, and drivetrain components. Advanced DIYers can manage, but novices may struggle without professional guidance. Troubleshooting skills are essential for resolving fitment and electrical issues. Ensure access to a well-equipped workspace and detailed repair manuals for a smooth process.
8.2 Time Estimates for the Swap
The G35 automatic to manual swap typically requires 6-8 hours for experienced mechanics, but can extend to 12-15 hours for DIY enthusiasts. Factors like mechanical aptitude, tool availability, and unexpected challenges influence the timeline. Advanced preparatory work, such as pre-assembling components, can significantly reduce downtime. Plan for additional time if troubleshooting wiring or fitment issues arises during the process.
Maintenance Tips Post-Swap
Regular clutch wear checks and transmission fluid level monitoring are crucial. Ensure consistent fluid levels and inspect for leaks to maintain optimal performance and longevity of the manual setup.
9.1 Clutch Wear Monitoring
Regularly monitor clutch wear to ensure optimal performance. Check the pedal feel for sponginess or excessive play, which may indicate worn components. Inspect the clutch disc, pressure plate, and release bearing every 6-12 months. Look for signs of uneven wear or glazing on the clutch face. Ensure the master and slave cylinders are functioning properly, as leaks or air in the system can affect clutch engagement. Addressing wear early prevents costly repairs and maintains smooth shifting.
9.2 Transmission Fluid Checks
Regular transmission fluid checks are essential for maintaining the health of your manual transmission. Use a high-quality gear oil suitable for your specific transmission type. Check the fluid level every 5,000 to 10,000 miles, ensuring it reaches the recommended mark on the dipstick. Look for dark or dirty fluid, which indicates it’s time for a change. Avoid overfilling, as it can cause damage. Replace the fluid every 30,000 to 50,000 miles for optimal performance.
Community and Forums
Engaging with online communities like MY350Z.COM and G35Driver provides invaluable support and resources for transmission swaps. Members share DIY guides, troubleshooting tips, and personal experiences, fostering a collaborative environment.
10.1 Online Resources for Support
Online forums like MY350Z.COM and G35Driver offer extensive support for G35 transmission swaps. These platforms provide detailed DIY guides, troubleshooting tips, and personal experiences from enthusiasts. Specific threads, such as the “5AT to 6MT Swap INFO, DIY, GUIDE Thread!”, serve as invaluable resources for planning and executing the swap. Active community members share expertise, making these forums indispensable for overcoming challenges and ensuring a successful conversion.
10.2 Recommended Communities and Threads
Join forums like MY350Z.COM and G35Driver for tailored advice and real-world insights. Threads such as “5AT to 6MT Swap INFO, DIY, GUIDE Thread!” are packed with detailed instructions and member experiences. Facebook groups like “G35/G37 Enthusiasts” offer peer support and shared knowledge. Additionally, Reddit’s r/InfinitiG35 community provides a wealth of resources, including member-shared guides and troubleshooting tips to ensure a smooth swap process.
The G35 automatic to manual swap is a complex yet rewarding modification, offering enhanced performance and driver engagement. It requires effort and investment but delivers immense satisfaction for driving enthusiasts.
11.1 Final Thoughts and Benefits
Converting the G35 from automatic to manual is a challenging but rewarding endeavor, offering enhanced performance and a more engaging driving experience. The manual transmission provides better control and a deeper connection to the vehicle, making it ideal for enthusiasts. While the process requires significant time and financial investment, the benefits of improved driving dynamics and satisfaction make it worthwhile for those passionate about driving.