G35 Manual Transmission Swap
Swapping an automatic Infiniti G35 to a manual transmission is a popular modification. It involves sourcing parts like the transmission, pedals, and ECU, and addressing wiring and drivetrain compatibility. While challenging, the result is a more engaging driving experience.
Parts Required for the Swap
A successful G35 manual transmission swap requires gathering various essential components. The centerpiece is a compatible manual transmission, often sourced from a 350Z or a manual G35. The CD00A (CD009) is a common choice. Beyond the transmission itself, you’ll need a matching clutch kit, flywheel, and pressure plate. Pedal assemblies for the clutch and brake are necessary, including the master and slave cylinders.
The transmission mount, driveshaft, and differential may require modification or replacement for proper fitment. A manual transmission’s wiring harness, ECU, and related sensors are crucial for electronic control. Smaller but essential parts include the shifter assembly, linkage, and all necessary hardware like bolts and brackets. Don’t forget the clutch lines and fluid reservoir. Thorough research and a comprehensive parts list are vital for a smooth swap process. Consider sourcing parts from a donor car or purchasing a complete swap kit to simplify the process.
Cost of the Swap
The cost of a G35 manual transmission swap can vary significantly depending on several factors. Sourcing parts from a donor car can be more economical than buying new components, but condition and availability can be concerns. Purchasing a complete swap kit can simplify the process but comes at a premium. Labor costs contribute significantly to the overall expense, with shop rates and the complexity of the swap influencing the final price.
The chosen transmission, clutch, and flywheel also impact the cost. OEM parts tend to be more expensive than aftermarket options, but offer better reliability and compatibility. Additional expenses might include modifications to the driveshaft, differential, or transmission crossmember. Unforeseen issues during the swap can also add to the cost. Expect a range from $2,000 to $7,000 or more, depending on these variables. Thorough planning and budgeting are crucial before undertaking this modification. Consider obtaining quotes from reputable shops specializing in transmission swaps to get a more accurate estimate.
Labor Involved in the Swap
Swapping a G35’s automatic transmission to manual is a labor-intensive process, requiring significant mechanical expertise. The procedure involves removing the automatic transmission, torque converter, and related components. Then, installing the manual transmission, clutch, flywheel, and necessary hardware follows. Modifications to the transmission crossmember might be required, and the driveshaft may need adjustments for proper fitment.
The wiring harness requires significant attention, including integrating the clutch pedal and switch, and potentially modifying the ECU. Bleeding the clutch hydraulic system is essential after installation. Depending on the chosen components and the car’s condition, custom fabrication or adjustments might be necessary. This complexity makes professional installation highly recommended unless you have extensive experience with transmission swaps. The labor time can range from several days to a week or more, depending on the mechanic’s skill and any unforeseen complications. Factor in labor costs when budgeting for this modification, as they contribute significantly to the overall expense.
Common Issues During the Swap
Several issues can arise during a G35 manual transmission swap; Sourcing compatible parts, particularly the transmission, clutch, flywheel, and ECU, can be challenging. Ensuring proper fitment of the transmission and driveshaft sometimes requires modifications to the transmission crossmember and adjustments to the driveshaft length. Wiring harness integration can be complex, involving the clutch pedal switch and potentially ECU modifications.
Bleeding the clutch hydraulic system is crucial but can be tricky. Compatibility issues between the manual transmission and the car’s existing differential might necessitate a differential swap. Additionally, finding experienced mechanics familiar with this specific swap can be difficult. Improper installation can lead to grinding gears, clutch slippage, or other drivetrain problems. Thorough research and careful planning are essential to minimize potential issues and ensure a successful swap. Addressing these potential complications beforehand can save time and money in the long run.
Benefits of a Manual Transmission
Swapping to a manual transmission in a G35 offers several benefits. Many drivers appreciate the increased control and engagement that a manual transmission provides, allowing for more precise gear selection and a more connected driving experience. This heightened control can be particularly rewarding on spirited drives or track days. Manual transmissions generally weigh less than automatics, potentially improving the car’s performance and fuel economy. The direct mechanical connection also eliminates the power loss associated with automatic transmissions’ torque converters, further enhancing performance.
Furthermore, manual transmissions are often simpler and more durable than automatics, potentially leading to lower long-term maintenance costs. The ability to select the optimal gear for any given situation can improve fuel efficiency in certain driving scenarios. Finally, for many enthusiasts, the satisfaction of mastering the skill of driving a manual transmission adds to the overall enjoyment of owning and driving a G35. This heightened driver engagement and control contributes significantly to the appeal of manual transmissions.
Comparison⁚ Swapping vs. Buying a Manual G35
Deciding between swapping an automatic G35 to manual or buying a factory manual model involves weighing cost, effort, and potential benefits. A manual swap can be expensive, requiring parts sourcing, labor, and potential custom fabrication. Finding a reputable shop experienced with this specific swap is crucial for a successful outcome. Buying a factory manual G35 can simplify the process, avoiding the complexities of the swap. However, finding a well-maintained manual G35 in the desired condition and mileage might be challenging.
Cost is a major factor. A swap’s final cost can be unpredictable, while a manual G35’s price is more transparent upfront. The swap offers customization potential, allowing for aftermarket clutch and transmission upgrades. Buying a factory manual provides a stock experience, which might be preferred by some. Ultimately, the best choice depends on individual priorities, budget, mechanical aptitude, and desired level of customization. A thorough cost analysis and assessment of available resources are essential before making a decision.
OEM Manual Transmission Options (CD00A/CD009)
The Infiniti G35 offered two primary OEM manual transmission options⁚ the CD00A and the CD009. The CD00A, found in earlier models, is generally considered robust but can suffer from synchronizer issues, leading to grinding during shifts. The CD009, introduced later, addressed some of these issues with revised synchronizers and improved shift feel. Both transmissions are 6-speed units and are sourced from Nissan/Infiniti vehicles like the 350Z.
When choosing a transmission for a manual swap, consider the CD009 for its refined design. However, the CD00A remains a viable option, especially if budget is a concern. Ensuring a well-maintained transmission, regardless of the choice, is crucial for long-term reliability. Inspecting for leaks, excessive play, and smooth shifting is essential before purchasing a used transmission. Rebuilding a used transmission can offer a balance between cost and reliability. Ultimately, the best choice depends on individual budget and desired performance characteristics.
Aftermarket Manual Transmission Options
While OEM CD00A and CD009 transmissions are common choices for G35 manual swaps, exploring aftermarket options can unlock higher performance potential. Companies like Collins offer adapter kits to mate stronger transmissions, such as the Tremec T56, to the VQ35DE engine. These aftermarket transmissions often boast increased torque capacity, improved shift feel, and more aggressive gear ratios, catering to modified engines or track-focused builds.
However, choosing an aftermarket transmission introduces complexities. Adapter kits require precise installation, and custom fabrication may be necessary for proper fitment. Driveshaft modifications are often required to accommodate the different transmission length and output flange. Wiring harnesses may also need adaptation for proper communication with the vehicle’s ECU. Furthermore, the increased cost of aftermarket transmissions and associated components should be carefully considered. Ultimately, the decision to go aftermarket depends on the desired performance level and the willingness to undertake a more involved swap process.
Clutch and Flywheel Options
Selecting the right clutch and flywheel combination is crucial for a successful G35 manual swap. OEM clutch kits offer a good balance of performance and daily drivability, but aftermarket options cater to various driving styles and power levels. Upgraded clutch discs with performance friction materials provide higher clamping force and better heat dissipation for aggressive driving or modified engines. Lightweight flywheels reduce rotational inertia, improving throttle response and acceleration, but can impact low-speed drivability and increase chatter.
Consider your driving style and engine modifications when choosing a clutch and flywheel. A sprung hub clutch can dampen drivetrain vibrations, offering smoother engagement for street use. A rigid hub clutch provides a more direct connection, preferred for track driving. Flywheel weight is a trade-off between performance and comfort. Lighter flywheels enhance responsiveness but can make the car less forgiving in traffic. Balancing the clutch and flywheel assembly is essential to avoid vibrations and premature wear. Researching different brands and materials will help determine the optimal setup for your specific needs and driving style.
Transmission Crossmember Modifications
The transmission crossmember, a structural component supporting the transmission, often requires modification during a G35 manual swap. While some claim the automatic transmission crossmember can be reused with minor adjustments, using a manual transmission crossmember is generally recommended for proper fitment and drivetrain geometry. The manual crossmember provides the correct mounting points and ensures optimal drivetrain angles, minimizing vibrations and stress on components.
If reusing the automatic crossmember, modifications may involve cutting and welding or drilling new mounting holes. This requires precise measurements and fabrication skills to maintain proper alignment. An incorrectly modified crossmember can lead to drivetrain binding, premature wear, and even damage to the transmission. Sourcing a used manual transmission crossmember from a donor car or purchasing a new aftermarket unit is often the preferred solution, simplifying the swap process and ensuring proper fitment. Always consult reputable sources and consider professional assistance if unsure about the necessary modifications.
Wiring Harness and ECU Considerations
The wiring harness and ECU (Engine Control Unit) require attention during a G35 manual transmission swap. The automatic transmission’s wiring harness needs modifications or replacement with a manual transmission harness. This involves connecting the clutch pedal position sensor, reverse light switch, and other manual transmission-specific components. Some harnesses may require splicing or repinning to integrate seamlessly.
The ECU also needs to be reprogrammed or replaced with a manual transmission-compatible unit. The automatic transmission ECU controls shift points and other automatic functions that are not relevant to a manual setup. A manual ECU or a reprogrammed unit ensures proper engine management and eliminates potential issues like limp mode or check engine lights. Researching specific ECU compatibility and programming options for your G35 model year is crucial for a successful swap. Overlooking these considerations can lead to drivability problems and hinder the full potential of the manual transmission.
Driveshaft and Differential Compatibility
Driveshaft and differential compatibility are essential factors in a G35 manual transmission swap. The automatic and manual G35s often have different driveshaft lengths and flange configurations. Using the correct driveshaft ensures proper fitment and avoids vibrations or binding. In some cases, a custom driveshaft may be necessary for optimal performance.
The differential ratio should also be considered. Automatic G35s typically have different final drive ratios compared to their manual counterparts. Swapping to a manual transmission often necessitates changing the differential to a compatible ratio for optimal acceleration and fuel economy. Using the incorrect ratio can negatively impact performance and drivability. Researching specific driveshaft and differential compatibility for your G35 model year is vital for a successful and efficient manual swap. Ignoring these aspects can lead to drivetrain issues and compromise the overall driving experience.