Replaces the worn RE5R05A solenoid pack on 2004-2010 Nissan Titan 5.6L so the trans stops flaring, banging shifts and dropping lockup.
If your 2004-2010 Nissan Titan with the 5.6L V8 is flaring the 1-2 shift, slamming into fifth, losing torque converter lockup on the highway, or dropping into limp mode with a stack of solenoid codes, the solenoid pack bolted to the RE5R05A valve body is the first place to look. This kit replaces that pack as a set, built to the OE numbers 63431A-U and 31941-1FX02 (319411FX02), so you fix every worn coil in one trip under the truck instead of chasing them one at a time.
The RE5R05A is a Jatco-built five-speed rear-drive automatic, and in the Titan it sits behind the VK56 V8. The transmission computer does not move any shift valve directly; it switches a row of solenoids on the valve body, and each one sends or vents oil to a clutch, a brake band circuit, the converter clutch or the line pressure regulator. When a coil weakens or its seat wears from heat and debris, the computer still commands the shift, but the oil arrives late, short or not at all. On a heavy, tow-rated pickup that shows up first as flare and harsh engagement, because the Titan asks the clutches to hold a lot of torque.
Two solenoids in this pack matter most to Titan owners: the line pressure solenoid, which sets how hard every clutch is clamped, and the torque converter clutch solenoid, which locks the converter at cruise. Both are fed through the same pilot circuit in the valve body, so a weak one can mimic the other.
Scan for codes first and note whether they are electrical (open or short) or performance (ratio error, function). An electrical code with a good harness points straight at a coil. Check the fluid: if it is dark and smells burnt, the solenoids failed because of the fluid, and a new pack alone will not last. Rule out coolant in the transmission too, since the Titan's in-radiator cooler can fail and push water into the unit. Our RE5R05A service guide walks through the code list, the pilot valve wear that can look exactly like a bad solenoid, and the fluid check.
This kit is listed for the 2004-2010 Nissan Titan with the 5.6L V8 and the RE5R05A automatic, matching OE numbers 63431A-U and 31941-1FX02. The same transmission family also went into the Armada, Pathfinder, Xterra, Frontier and Infiniti QX56, and the solenoids were made by more than one supplier over the years, so do not order on the vehicle name alone. Pull the pan and compare the part numbers on your existing solenoids, or send us your year and VIN and we will check it. If your truck is not a Titan, browse the full RE5R05A parts collection for the other kits, including the general 2005-2021 RE5R05A solenoid kit.
If the codes keep coming back with new solenoids and clean fluid, the problem has moved into the valve body bores or the control module. In that case look at the Titan valve body with TCM and solenoids rather than a second solenoid set.
| OE part numbers | 63431A-U, 31941-1FX02, 319411FX02 |
| Fits | Nissan Titan V8 5.6L 2004-2010, RE5R05A 5-speed automatic |
| Mounting | Internal, valve body mounted |
| Shipping weight | 2.2 lb |
| Package size | 5.9 x 5.9 x 5.9 in |
| Ships from | USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The listing covers 2004-2010 Titan 5.6L with OE numbers 63431A-U and 31941-1FX02. Later Titans use the same RE5R05A family, but match the numbers printed on your existing solenoids or send us your VIN before ordering.
The solenoids share the same heat and fluid history, so when one fails the others are usually close behind. Replacing the set at once avoids dropping the valve body a second time.
Nissan specifies Genuine Nissan Matic S ATF, with Matic J as the approved alternative. Do not use Matic D in the transmission; that is the transfer case fluid on 4WD trucks.
Yes. The transmission cooler is inside the radiator, and when it fails coolant mixes with the ATF. That contamination damages solenoids and clutches, so replace the cooler or radiator if you find milky fluid.
Clear the codes and reset the transmission adaptive values with a capable scan tool, then road test through all five gears with the fluid at operating temperature so the computer can relearn shift pressures.
