Introduction

Upgrading your Nissan 350Z with a Nismo Limited Slip Differential (LSD) is one of the most effective modifications for transforming the car’s handling and traction. The factory open differential sends power to the wheel with the least resistance, which can lead to wheelspin and unpredictable corner exits. A Nismo LSD uses clutch packs or a helical gear design (depending on the specific model) to distribute torque more evenly, allowing both driven wheels to claw for grip. The result is sharper turn-in, better acceleration out of corners, and a more confidence-inspiring feel whether you’re on a track or a twisty back road.

This guide provides a comprehensive, step-by-step installation process for swapping your 350Z’s factory differential with a complete Nismo LSD unit. We cover every tool, safety precaution, and torque specification you need, along with a realistic cost breakdown so you can budget accordingly. By the end, you’ll have all the knowledge to perform this upgrade in your home garage. Let’s get started.

Why Choose a Nismo LSD for Your 350Z?

The Nissan 350Z (Z33 chassis) came from the factory with an open differential in most trims, except for the Track and Nismo models which received a viscous LSD. While the viscous unit offers some limited slip action, it can degrade over time and lacks the mechanical lockup of a clutch-type or gear-type LSD. The Nismo LSD is a clutch-type unit that provides progressive lockup under acceleration—ideal for both street and track use. Key benefits include:

  • Improved traction – Reduces inside wheel spin during aggressive cornering.
  • Better power delivery – More consistent acceleration exiting turns.
  • Enhanced stability – Helps keep the rear end planted during high-speed cornering.
  • Durability – Nismo parts are designed to withstand higher loads than factory components.
  • Direct bolt-on fitment – The complete Nismo differential unit replaces the factory assembly without modification.

For 350Z enthusiasts who plan to autocross, track day, or even drift, the Nismo LSD is a proven upgrade that delivers real performance gains.

Tools and Materials Required

Before you begin, gather everything you need. Having the right tools on hand saves trips to the hardware store and keeps the job flowing smoothly.

Tools

  • Floor jack (at least 2-ton capacity) and four jack stands
  • Wheel chocks
  • Socket set with metric sockets (10mm, 12mm, 14mm, 17mm, 19mm, 21mm)
  • Breaker bar (½-inch drive)
  • Torque wrench (½-inch drive, 20–150 lb-ft range)
  • Allen keys (for some axle bolts)
  • Pry bar or flathead screwdriver
  • Drain pan (for old gear oil)
  • Brake cleaner spray
  • Shop towels or rags
  • Safety glasses and mechanic’s gloves
  • Penetrating oil (like WD-40 or PB Blaster)
  • Funnel (for filling differential)
  • Dead blow hammer (for seating axles)

Parts and Consumables

  • Nismo LSD complete differential unit (Nissan part numbers: 38310-3F600 or 38310-CD000 depending on model year; verify compatibility)
  • Gear oil – 1.7 quarts (approx 1.6 liters) of 75W-90 GL-5 specification (Nismo recommends genuine Nissan differential fluid or an equivalent synthetic LSD fluid)
  • New differential cover gasket (or RTV sealant)
  • Axle seals (optional but recommended)
  • Thread locker (blue Loctite 242) for driveshaft bolts
Note: Some Nismo LSD units come pre-filled with fluid; check your specific part. If not, you will need to fill after installation. Always use a fluid specifically designed for limited slip differentials to avoid clutch chatter.

Preparation and Safety

Working under a vehicle carries risk; always take precautions.

  • Park on a flat, level surface. Engage the parking brake and place wheel chocks in front of the front tires.
  • Let the vehicle cool if it has been driven recently—exhaust and differential components can be hot.
  • Disconnect the battery negative terminal to prevent accidental starter engagement.
  • Use jack stands rated for the vehicle’s weight. Never rely solely on the jack.
  • Wear safety glasses and gloves. Gear oil is corrosive and smells strongly.

Before lifting the car, it's a good idea to loosen the rear axle nuts and driveshaft bolts while the wheels are still on the ground. This prevents the wheel hub from spinning when you try to break the bolts free later.

Step-by-Step Installation

Step 1: Lift the Rear of the Vehicle

Use the floor jack to lift the rear end by the differential housing or the factory jacking points. Place jack stands under the rear subframe or designated lift points. Ensure the car is stable before crawling underneath. Remove the rear wheels to access the axle shafts and differential.

Step 2: Drain the Differential Fluid

Position a drain pan under the differential. On the 350Z, the differential has both a fill plug and a drain plug, but if you are swapping the entire unit, you can simply remove the cover after unbolting it. However, to reduce mess, first remove the lower drain plug (usually a ½-inch square drive or hex socket). Let the old fluid drain completely, then reinstall the drain plug temporarily to keep debris out.

Tip: If the fluid is very dark or smells burnt, inspect the old unit for metal flakes—normal wear, but heavy debris may indicate bearing damage.

Step 3: Remove the Axle Shafts (Halfshafts)

Each axle shaft connects the differential to the wheel hub. On the 350Z, the axle shafts are retained with a C-clip inside the differential, but you do not need to remove the axles completely—just unbolt them from the differential flanges.

  1. Locate the four bolts (12mm or 14mm) securing each axle flange to the differential output flanges.
  2. Use a socket and breaker bar to remove the bolts. If they are stubborn, spray with penetrating oil and wait a few minutes.
  3. Gently pry the axle shafts away from the differential using a pry bar. They will slide out of the differential slightly. Support the shafts with a wire hanger or similar to keep them out of the way.
  4. Be careful not to damage the axle boots. If the axles feel tight, you may need to rotate the hub slightly to align splines.

Step 4: Remove the Driveshaft

The driveshaft runs from the transmission to the differential. It is held by four bolts at the differential flange.

  1. Support the driveshaft with a jack stand or strap—do not let it hang unsupported or you may damage the center bearing.
  2. Remove the four bolts (14mm) using a socket and breaker bar. Note: The bolts may be threadlocked; apply even pressure.
  3. Slide the driveshaft forward and away from the differential. Secure it out of the way.
Important: Mark the orientation of the driveshaft flanges with a paint pen before disassembly. The driveshaft is balanced, and reattaching it in the same position prevents vibration.

Step 5: Remove Differential Mounting Bolts

The differential is held to the rear subframe by four main mounting bolts (two per side) and a rear mount at the back of the case.

  1. Place a jack under the differential to support its weight.
  2. Remove the two large bolts (17mm or 19mm) that pass through the rubber mounts on each side of the differential.
  3. Remove the single bolt (14mm) holding the rear differential mount.
  4. Carefully lower the differential slightly with the jack. Check for any remaining connections (speed sensor wire, breather hose?). On the 350Z, the speed sensor is on top of the diff—disconnect the electrical connector.
  5. Lower the differential and slide it out from under the car. It is heavy (approximately 50 lbs); use a helper or a transmission jack.

Step 6: Install the Nismo LSD Differential

With the old differential removed, clean the mounting surfaces on the subframe and inspect the axle seals and driveshaft flange.

  1. Lift the new Nismo LSD differential into position. Line up the mount holes and slide it onto the studs. Install the side mount bolts and torque to 60–70 lb-ft (check factory service manual for exact specs).
  2. Reinstall the rear mount bolt—do not fully tighten until the driveshaft and axles are attached to avoid binding.
  3. Install the driveshaft: slide the flange onto the differential output flange. Use new bolts if supplied, and apply a drop of blue Loctite. Torque to 75–80 lb-ft in a crisscross pattern.
  4. Reattach the axle shafts: slide the flanges onto the differential output flanges. Install the four bolts per side and torque to 55–65 lb-ft.
  5. Reconnect the speed sensor wire and any breather hose.
  6. Torque the rear mount bolt to 45–50 lb-ft.

Step 7: Install Differential Cover (if separate) and Fill with Fluid

If your Nismo LSD unit came without a cover, reuse the factory cover with a new gasket or RTV sealant. Most complete Nismo units include a cover, but verify.

  1. Clean the mating surfaces thoroughly. Apply a thin bead of RTV if using, or place the new gasket.
  2. Install the cover bolts and torque to 30–35 lb-ft in a star pattern.
  3. Remove the fill plug (located on the side of the differential). Use a funnel or a squeeze bottle to add gear oil until it starts to drip out of the fill hole. The capacity is approximately 1.7 quarts (1.6 liters).
  4. Install the fill plug and torque to 25–30 lb-ft.
Tip: After filling, let the car sit for a few minutes, then recheck the fluid level. It should be even with the bottom of the fill hole.

Step 8: Lower the Vehicle and Test

Reinstall the rear wheels, lower the car to the ground, and torque the lug nuts to 80 lb-ft. Start the engine and shift through the gears with the car stationary to distribute fluid. Drive slowly for a few miles, then check for leaks. Take a few turns to feel the LSD engage. Listen for unusual noises; a slight whine is normal for a clutch-type LSD during tight turns.

Cost Breakdown

Here is a realistic estimate for the complete project, assuming you purchase a new Nismo LSD differential and some tools.

ItemEstimated Cost
Nismo LSD complete differential unit$800 – $900
Differential gear oil (1.7 quarts)$40 – $60
New axle seals (pair, optional)$20 – $30
Cover gasket or RTV$5 – $15
Shop supplies (towels, brake cleaner, Loctite)$15 – $25
Tools (if not already owned: jack, stands, socket set, torque wrench, etc.)$100 – $200
Total Estimated Cost$980 – $1,230

If you already possess most tools, your cost will be around $900–$1,000. The Nismo LSD unit itself is the biggest expense, but it is a direct OEM upgrade that retains factory reliability.

Common Pitfalls and Troubleshooting

  • Driveshaft bolts won’t come loose. Use penetrating oil and a breaker bar. If necessary, apply heat with a torch (careful not to damage seals).
  • Axle shaft binding. Ensure you do not drop the axle while removing; support it. When reinstalling, gently rotate the hub to align splines.
  • Fluid leak from fill or drain plug. Use new copper crush washers if applicable. Tighten to spec.
  • Clutch chatter on tight turns. This is normal for a new clutch-type LSD. It should diminish after a few hundred miles. Ensure you used proper LSD fluid.
  • Check engine light after installation. Verify the speed sensor connector is fully seated. A damaged wire can cause a code.

Resources and Further Reading

For additional guidance, refer to these trusted sources:

Conclusion

Installing a Nismo LSD in your Nissan 350Z is a rewarding project that delivers a noticeable improvement in traction and cornering confidence. By following the detailed steps in this guide, you can complete the swap in a weekend with basic mechanical skills and the right tools. The cost, around $1,000 for parts and supplies, is a worthwhile investment in your car’s performance. Once the differential bed in, you’ll feel the difference every time you power out of a turn. Enjoy the upgraded drive!