RE5R05A Overhaul Kit, new and ready to install. Fits the RE5R05A. Ships fast from the USA.
When a Nissan Frontier, Pathfinder, Xterra, Titan or Armada, or an Infiniti QX56, starts slipping on the highway, flares between gears, or smells burnt every time you check the dipstick, the clutches inside the RE5R05A are usually worn out and the seals have been leaking pressure for a while. Fixing that properly means a rebuild, and this new RE5R05A overhaul kit is built for exactly that job. As the photo shows, the kit goes beyond a basic seal set: it includes the friction plates and steel plates for the clutch packs, the piston seals and O-rings, the sealing rings, the valve body separator gaskets, the pan gaskets and the housing gaskets, so the whole unit can be refreshed in one order. It carries a 1-year warranty.
The RE5R05A is a Jatco-built five-speed rear-drive automatic. It makes its five gears with several clutch packs and brakes, and each one is applied by fluid pressure that the valve body routes through drilled passages and rotating sealing rings to a piston. Every rubber seal, every Teflon ring and every paper gasket in that path is a place where pressure can escape. After years of heat they harden and shrink, and the frictions glaze or wear thin. The result is a transmission that still shifts but takes longer to apply each clutch, which creates more heat and wears the frictions faster. An overhaul kit replaces all of those wear items at the same time, so every circuit is sealed and every clutch pack starts with fresh material.
Start with a fluid check and a scan for codes. A slip that shows up in only one gear might be a single clutch pack, while slipping across several gears with dark fluid points to general wear that only a full rebuild will cure. Pay close attention to the color: Sonnax reports that roughly half the RE5R05A cores it receives have water in them from a failed cooler inside the radiator. Pink, milky fluid means the frictions have likely delaminated, and the cooler must be replaced or bypassed or the new kit will be ruined the same way. Electrical faults are the other trap. Solenoid and valve body problems on this unit can feel like slipping, so test the solenoids before tearing the transmission down. Our RE5R05A service and diagnosis guide lays out the checks in order.
This kit is listed for the RE5R05A without a specific year range. The unit was used in rear-drive Nissan and Infiniti cars, trucks and SUVs from the 2002 Infiniti Q45 onward, including the Frontier, Pathfinder, Xterra, Titan, Armada and QX56, and it went through several revisions along the way. Plate counts, pan shapes and valve body gaskets can differ between early and late units, so lay out the parts in our photo against your own pan, separator plates and clutch packs before you start the rebuild, or send us your year and VIN and we will confirm the match first. For more year-specific kits, see the master rebuild kit for the Titan and Armada or browse the full RE5R05A parts collection.
Soak every friction plate in clean ATF for at least 30 minutes before assembly, and soak the rubber seals as well so they slide into place without rolling. Coat the sealing rings with assembly gel. Measure each clutch pack clearance with a feeler gauge or a dial indicator and correct it with the proper selective plate rather than guessing. Air check every clutch and brake circuit at regulated pressure before you close the case; ATRA has documented RE5R05A units where worn sealing ring lands, not the rings themselves, were what caused a harsh shift. Inspect the drums and hard parts while the unit is apart and replace anything cracked or scored, such as a worn RE5R05A input drum. If the valve body was the source of the original complaint, a RE5R05A solenoid kit is worth adding now. Refill with Nissan Matic-S ATF and road test until the fluid is fully warm before releasing the vehicle.
| Fits | RE5R05A |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The kit shown includes friction plates, steel plates, piston seals and O-rings, sealing rings, valve body separator gaskets, pan gaskets and housing gaskets. Compare the photo with your own unit before starting the rebuild.
It is listed for the RE5R05A, which was used in the Titan and Armada as well as the Frontier, Pathfinder, Xterra and QX56. Because the unit was revised over the years, send us your year and VIN if you want the fitment confirmed before it ships.
Replace the filter, inspect every drum, bushing and sealing ring land, and replace or bypass the radiator cooler if there is any sign of coolant in the fluid. Many builders also replace the solenoids while the valve body is out.
Nissan specifies Matic-S ATF for these transmissions. Fill and check the level with the fluid at operating temperature.
Yes, it is good practice. Clear the adaptive values with a Nissan-capable scan tool and give the transmission a full warm-up drive so it can relearn shift timing on the fresh clutches.
