Nissan Pathfinder R51 gearbox: complete design and repair manual

Gearbox Nissan Pathfinder R51 (2005–2012) is one of the key components of a crossover, on which not only the dynamics, but also the reliability of the car depends. Owners of this model are often faced with questions: what gearbox is installed on their version, how to recognize the first signs of a malfunction, and whether it is worth repairing the unit or is it better to replace it with a contract one. In this article we will look at all types of transmissions, which were installed on Pathfinder R51, typical problems, diagnostic methods and nuances of repair - from oil changes to major restoration.

Feature R51 the fact that it was equipped with both classic “mechanics” and “automatic”, as well as all-wheel drive systems with a transfer case. At the same time automatic transmissions (especially RE5R05A) are considered the most vulnerable - their service life often does not exceed 200–250 thousand km with aggressive driving. At the same time mechanical boxes (FS6R31A) with proper maintenance they last 400+ thousand km. We've compiled data from service manuals, owner reports, and expert reviews to help you make an informed decision about transmission repair or replacement.

Types of gearboxes for Nissan Pathfinder R51

On Pathfinder R51 Three main types of transmissions were installed, each of which had its own modifications depending on the sales market and configuration:

• 🔧 Manual transmission — FS6R31A (6-speed), installed on gasoline VQ40DE (4.0 l) and diesel YD25DDTi (2.5 l) version. It is considered the most reliable, but requires regular checking of the clutch.
• 🔄 Automatic transmission — RE5R05A (5-speed), most common on gasoline models. Known for problems with the valve body and solenoids after 150 thousand km.
• 🌍 All-wheel drive system with transfer case AT3501B (for 4WD versions). Includes an additional gearbox and a coupling for connecting the rear axle, which complicates diagnostics.

It is important to consider that automatic transmissions on Pathfinder R51 had different firmware depending on the year of manufacture. For example, models 2005–2007. often suffer from switching delays due to outdated valve body software. After 2008 engineers Nissan the algorithms have been improved, but there is a problem with wear of friction clutches remained relevant.

To accurately determine the type of transmission on your car, check:

• 📄 VIN code (7th character indicates the type of transmission: M - mechanics, A - automatic).
• 🔍 Label on the box (usually located on the top of the crankcase).
• 📋 Documentation — in the service book or electronic catalog Nissan (For example, ETM).

Common Nissan Pathfinder R51 transmission faults

Each type of transmission R51 has its own “weak points”. Below we have collected top 5 problems, with which owners turn to services most often:

Gearbox type	Malfunction	Reason	Repair cost (approx.)
RE5R05A (automatic transmission)	Jerks when shifting 2–3 gears	Worn friction discs, clogged valve body	from 30,000 ₽ (partial repair)
RE5R05A	Oil leak from under the pan	Gasket deformation or crack in crankcase	from 5,000 ₽ (gasket replacement)
FS6R31A (manual transmission)	Crunching sound when engaging reverse gear	Worn synchronizers or bearings	from 15,000 ₽ (replacement of synchronizer)
AT3501B (handout)	Noise when driving at high speed	Worn differential chains or bearings	from 40,000 ₽ (major repairs)

The problem with automatic transmission solenoids. On RE5R05A after 100–120 thousand km, solenoids often fail TCC (torque converter lockup) and Shift (responsible for gear shifting). Symptoms: "Check Engine" light comes on with code P0730 or P0740, the box “kicks” during acceleration. In 80% of cases, replacing solenoids and flushing the valve body helps, but if the problem persists, it will be necessary complete overhaul of the gearbox with replacement of clutches and brake bands.

⚠️ Attention: If your automatic transmission RE5R05A started to “slip” when starting off, do not delay diagnostics under any circumstances! This could be a sign critical wear of the torque converter, which, if destroyed, will clog the oil filter and disable the entire box. The average cost of a new torque converter is from 50,000 rubles.

Transmission diagnostics: when is it time to go to a service center?

Many owners Pathfinder R51 They ignore the first “bells” of a gearbox malfunction, attributing them to “vehicle features”. However, even small changes in transmission behavior can signal serious problems. Here key symptoms, in which it is worth immediately diagnosing:

• 🚨 Burning smell from automatic transmission oil - a sign of overheating of the clutches or lack of fluid.
• 🔊 Extraneous sounds: hum when coasting (wear of bearings), grinding noise when engaging gear (problems with the clutch or synchronizers).
• ⚡ Jerking or slipping - are especially dangerous on automatic transmissions, as they may indicate wear on the torque converter.
• 💧 Oil leaks under the car (red fluid - ATF, brown - engine oil or transmission).

For initial diagnosis, you can check yourself:

1. Automatic transmission oil level — on a heated box (ATF temperature should be 50–60°C). Use the dipstick (on RE5R05A it is located to the right of the engine).
2. Oil color and smell — fresh ATF is red in color, without a burning smell. If the fluid is dark or has metal particles, replacement is required.
3. Error codes - connect the scanner (for example, ELM327) and check for transmission errors (codes P07XX).

Check the oil level in the automatic transmission/manual transmission |

Inspect the box for smudges|

Test the smoothness of gear shifting|

Listen to the gearbox at idle and under load -->

If you find at least one of the listed symptoms, it is recommended to contact the service for computer diagnostics. Modern scanners (for example, Launch X431 or Bosch KTS) allow you to remove the parameters of the operation of the solenoids, pressure in the valve body and the state of the clutches. The average cost of such diagnostics is 1,500–3,000 rubles, but it will help avoid expensive repairs.

Gearbox maintenance: how to extend its service life?

Gearbox resource for Pathfinder R51 directly depends on the quality and regularity of service. The manufacturer recommends changing the automatic transmission oil every 60,000 km, but in Russian conditions (bad roads, frequent traffic jams) it is better to reduce this interval to 40,000–50,000 km. For manual transmissions, the transmission oil change interval is 90,000 km.

When choosing oil for RE5R05A refer to the specifications:

• 🛢️ Original oil — Nissan Matic S ATF (article KLE52-00004).
• 🔄 Analogues — Mobil ATF 3309, Idemitsu ATF Type-J.

For FS6R31A (mechanics) suitable oil with viscosity class 75W-90 and specification GL-4/GL-5. Popular options: Castrol Syntrans Transaxle 75W-90 or Motul Gear 300.

In addition to changing the oil, pay attention to:

• 🔧 Clutch condition (for manual transmission) - if there is slipping or jerking when starting, the disc or basket must be replaced.
• 🔗 Constant velocity joints (CV joints) — wear of the anthers leads to the ingress of dirt and destruction of the hinges.
• 🔄 Transfer case (for 4WD) - the oil in it is changed every 60,000 km (volume - 1.2 l, specification GL-5 80W-90).

⚠️ Attention: If you are exploiting Pathfinder R51 with a trailer or often drive off-road, reduce the oil change interval in the automatic transmission and transfer case by 30%. Overheating of the transmission fluid is the main cause of premature wear of the clutches!

Repair vs replacement: which is more profitable?

Transmission repair cost Pathfinder R51 varies from 20,000 to 150,000 ₽ depending on the type of fault. Let's look at in what cases repair is advisable, and when it is better to consider the option with contract box:

Fault type	Repair cost	Cost of contract gearbox	Recommendation
Replacing solenoids and flushing the valve body	20 000–35 000 ₽	80 000–120 000 ₽	Repair is more profitable
Overhaul of automatic transmission (replacement of clutches, brake bands)	60 000–90 000 ₽	80 000–120 000 ₽	Depends on the condition of the box
Bearing wear in transfer case	40 000–60 000 ₽	100 000–150 000 ₽	Repair is more profitable
Complete failure of the torque converter	50,000–70,000 ₽ (replacement only)	80 000–120 000 ₽	If the box is in good condition - repair

Contract checkpoints for Pathfinder R51 can be found at salvage yards or in specialized stores (for example, JapZap or Car-vin>). Average price:

• 🔧 FS6R31A (mechanics) - 50,000–80,000 rubles.
• 🔄 RE5R05A (automatic) - 80,000–120,000 rubles.

When purchasing a contract box, be sure to check:

• 📄 Guarantee (minimum 6 months).
• 🔧 Oil condition (if possible, drain some for analysis).
• 📊 Donor mileage (optimally up to 100,000 km).

Step-by-step instructions for changing the oil in an automatic transmission RE5R05A

Changing the oil in RE5R05A - a procedure that can be performed independently with a minimum set of tools. You will need:

• 🔧 10 mm wrench (for drain plug).
• 🛠️ 14 mm head (for pallet).
• 🧻 Rags, container for draining oil (minimum 5 l).
• 🛢️ New oil (9–10 l for a complete change).
• 🔧 New filter (31726-31X02) and pan gasket (31397-31X00).

Step-by-step algorithm:

1. Warm up the car to operating temperature (ATF should be 50–60°C).
2. Lift the car on a lift or drive it into a pit.
3. Drain the old oil through the plug (volume - about 4 l).
4. Remove the pan, replace the filter and gasket.
5. Reinstall the pan, tighten the bolts crosswise (torque - 10 Nm).
6. Fill in new oil through the dipstick (volume - 4–4.5 l).
7. Start the engine, engage all gears one by one (with a delay of 5 seconds), then check the oil level.

How to check the oil level in a RE5R05A automatic transmission?

1. Warm up the box (drive 10–15 km).

2. Place the car on a level surface.

3. With the engine running, move the selector to all positions, then return to P.

4. Remove the dipstick, wipe it, insert it again and remove it - the level should be between the marks HOT.

For complete oil change (with changing the fluid in the torque converter), special equipment will be required (for example, a ATF Exchange Machine). In this case, it is better to contact the service.

Where to repair the Pathfinder R51 transmission: choosing a service

Choosing a transmission repair service is a critical step. Poor quality repairs can lead to even more serious damage. Here's what you should pay attention to:

• 🔧 Specialization - look for services that deal specifically with Nissan or Japanese cars.
• 📄 Reviews - check Yandex.Maps, 2GIS or thematic forums (for example, Nissan-Club.ru).
• 💰 Price transparency - a good service will provide a detailed estimate before work begins.
• 🔧 Warranty — at least 1 year for automatic transmission repairs, 6 months for manual transmissions.

Average prices for repairs in Moscow and the regions (2026):

• 🔄 Automatic transmission diagnostics — 1,500–3,000 ₽.
• 🔧 Replacement of solenoids - 15,000–25,000 ₽.
• 🛠️ Overhaul of automatic transmission - 60,000–90,000 ₽.
• 🔧 Repair of handout — 30,000–50,000 ₽.

From well-known services specializing in Nissan, we can highlight:

• Nissan Service Center (official dealers) - high quality, but expensive spare parts.
• JapAuto (Moscow, St. Petersburg) - experience working with RE5R05A And FS6R31A.
• ATF-Master (network across Russia) - specialize in automatic transmissions.

⚠️ Attention: If you are offered “quick automatic transmission repair for 10,000 ₽” without diagnostics, this is a reason to be wary. Most often, this proposal hides an oil change and flushing, which will not solve the problem of worn clutches or solenoids.

FAQ: Frequently asked questions about the Nissan Pathfinder R51 gearbox

Is it possible to drive with the Check Engine light on if the transmission is working normally?

No. Even if the box shows no signs of malfunction, the error code (for example, P0730 or P0740) may indicate initial problems with the solenoids or valve body. Ignoring it will lead to worsening damage and more expensive repairs.

What oil is better to fill in the FS6R31A manual transmission?

Optimal choice - Nissan MT-XZ Gear Oil 75W-85 (article KE916-99932) or its analogues: Motul Gear 300 75W-90, Castrol Syntrans Transaxle 75W-90. It is important that the oil meets specification GL-4.

How much does a contract automatic transmission RE5R05A with warranty cost?

The price depends on the mileage and condition: from 80,000 to 120,000 rubles. The warranty is usually 6–12 months. Buy only from trusted suppliers (for example, JapZap, Car-vin) and ask for receipts indicating the donor's VIN.

Is it possible to repair the RE5R05A automatic transmission with your own hands?

Partially yes. For example, you can replace solenoids or oil yourself. However, major repairs (replacement of clutches, brake bands) require special equipment and experience. Errors during assembly can lead to complete failure of the gearbox.

What to do if the automatic transmission starts to slip when starting?

This is a sign of worn clutches or problems with the torque converter. Immediately stop using the vehicle and contact service! Further driving may lead to destruction of the planetary mechanism and the need to completely replace the gearbox.