Refurbished RE4F04B valve body with solenoids for 2000-2006 Nissan Maxima and Infiniti I30/I35, for harsh shifts, slipping and shift solenoid codes.
A 2000-2006 Nissan Maxima, Infiniti I30/I35, or X-Trail with a hard or delayed 1-2 shift, a flare between 2-3 or 3-4, a torque converter that surges at a steady highway speed, or a transmission that drops into limp mode and holds third gear is usually pointing at the RE4F04B valve body, not a transmission that needs to come out of the car. This is a refurbished RE4F04B valve body with the solenoid pack already mounted, pulled from a donor vehicle and tested, so it bolts in as a direct replacement for a worn or leaking factory unit.
The RE4F04B is the Jatco-built 4-speed automatic Nissan ran behind the VQ-series V6 in these vehicles. Its valve body routes line pressure through a set of precision bores to apply each clutch and band, and it carries the shift solenoids and the pressure-control solenoid the transmission control module uses to time every shift. Those solenoids are grounded internally through a crimped eyelet bolted to the body - a known weak point on this family, since a loose crimp can mimic a full solenoid failure. The RE4F04B is identified from the older RE4F04A by its internal solenoid wiring, which stays inside the case instead of running out through an external connector.
Pull codes first. If the fluid level and condition check out and you have a stored shift-solenoid, pressure-control, or TCC code, the valve body is the likely cause once the ground eyelet and harness connector have been ruled out. Worn valve bores bleed off line pressure in a way no amount of fresh fluid fixes, which is when a replacement body, rather than chasing one solenoid at a time, is the faster repair.
This valve body is built for the RE4F04B as used in the 2000-2006 Nissan Maxima, Infiniti I30 and I35, and the Nissan X-Trail. Confirm the transmission code on your unit's tag or in your service records before ordering, since the earlier RE4F04A shares the case but is not always interchangeable at the valve body - match the solenoid wiring and connector, not just the model year.
The job is done with the transmission in the car. Drain the fluid, drop the pan, unplug the solenoid harness connector, then remove the valve body bolts in the sequence your service manual lists and lower the assembly straight down so the check balls and accumulator springs stay in their bores. Confirm the manual valve lines up with the detent lever before torquing the new unit to spec. Refill with the Nissan-specified Matic fluid for your year - Nissan updated the spec across this generation, so our Nissan Matic S ATF service kit covers the later applications - and consider our Lubegard Platinum ATF protectant in the fresh fill. A touch of Lubegard Assemblee Goo on the check balls and springs keeps them seated while you set the body in place. If the bores elsewhere in this unit have worn to the point a straight valve body swap does not hold, our RE4F04B master rebuild kit covers the rest of the unit. Let the adaptive shift values relearn over several drive cycles after the swap.
| Transmission | RE4F04B (Jatco 4-speed automatic) |
| Fits | Nissan Maxima 2000-2006, Infiniti I30 and I35, Nissan X-Trail |
| Includes | Valve body with solenoids installed |
| Condition | Refurbished (removed from vehicle) |
| Finish | Machined |
Yes - this RE4F04B valve body ships with the shift and pressure-control solenoid pack already mounted, so you are not sourcing solenoids separately.
Start with a code scan. A stored shift-solenoid, pressure-control, or TCC circuit code along with a hard 1-2 shift or a shudder at cruise points at the valve body once you've confirmed the ground eyelet and harness connector are good; a shudder with no codes at all is more often the torque converter.
Use the Nissan-specified Matic fluid for your model year. Nissan moved through different Matic formulations across the 2000-2006 Maxima run, so match the spec on your fill cap or owner's manual rather than assuming one fluid covers the whole range.
Yes, the I30 and I35 used the same RE4F04B as the Maxima for these model years. Confirm the transmission code on your unit's tag before ordering since the two platforms occasionally carried different solenoid wiring.
Change the filter and fluid at the same time so debris from the old valve body does not circulate through the new one, and inspect the ground eyelet crimp on the pressure-control solenoid - a loose crimp alone can cause a hard 1-2 shift.
Yes - let the transmission control module relearn its adaptive shift values over several drive cycles. Shifts can feel slightly different for the first day or two while it adapts to the new valve body.
