1995-1998 Nissan 240SX S14 KA24DE Factory Automatic Transmission: RE4R01A Identity, Contents and Condition

310C0-45X81 is shown replaced by 310C0-44X63, which is the final checked 1995-1998 S14 KA24DE RE4R01A assembly identity and is discontinued on the exact OEM path checked. Torque converter 31100-43X02 is shown replaced by 31100-43X18, but the converter remains a separately inventoried component. Shifter/control and propeller-shaft production or equipment splits are not supersessions of the transmission. The shared RE4R01A family name, bellhousing resemblance or seller use of 240SX does not establish S13, truck/SUV, imported, manual or swap interchange.

Begin with both 17-character VINs, build dates and clear photographs of the donor transmission tag, case, bellhousing, pan, output, connectors and ports. Confirm US/LHD S14 Coupe, KA24DE and factory automatic equipment. Match the exact installed/service identity plus bellhousing and starter pattern, input/output splines, overall length, case and crossmember interfaces, electrical connectors/harness, sensors/solenoids, cooler fittings and lines, fill tube, shifter/cable and overdrive switch, flexplate, torque converter, mount, driveshaft and ABS branch. SCH-0020 controls mount identities; SCH-0047 controls S14 manual scope; SCH-0051 controls S13 automatic scope. Require a written inventory of transmission, torque converter, pan, valve body/electronics, internal/external harness, sensors, brackets, lines, tube, mount, crossmember, driveshaft, flexplate and hardware; none is presumed from complete. Ask for mileage, donor-running evidence, diagnostic codes, shift history, fluid color/odor and pan/debris inspection. Reject cracked or welded cases, broken ears, stripped threads, damaged splines, bent or open ports, cut wiring, broken connectors, burnt or water-contaminated fluid, excessive metal/friction debris, overheating, fire/flood exposure, missing converter and undocumented internal modification. Drain and cap lawfully, support the unit on a stable pallet and obtain freight/terminal, core, warranty and return terms in writing. Use qualified automatic-transmission diagnosis and installation, service or replace the cooler circuit as required, follow current Nissan fluid and adjustment procedures and complete authorized electrical/calibration checks without bypassing security, safety or emissions systems.

A professionally remanufactured unit can be considered only when the supplier identifies the exact S14 KA24DE factory-automatic application and documents the included converter, updated internals, test method, core condition rules, fluid/cooler requirements, warranty, labor coverage, freight and return process. AutoZone exposed model-level Grade A reman choices, while Reman-Transmission and CarPartPlanet exposed application-selection or quote paths; none replaces exact tag/interface confirmation. A generic RE4R01A, S13 transmission, truck/SUV unit, manual conversion or swap package is outside this guide.

US/LHD 1995-1998 S14 240SX KA24DE factory automatic only. Match both VINs/builds, transmission tag/service identity, case/connectors, converter, shifter/control equipment, ABS-dependent driveshaft and every written included part. A shared RE4R01A name does not prove S13, truck/SUV, imported or swap fit. Reject cracked/welded cases, burnt or contaminated fluid, debris, damaged splines/connectors, open ports, flood/fire exposure or undocumented modification; require qualified diagnosis, cooler service, installation and final operation checks.

Supersede reviewed 15 unique research sources for this guide. 4 also appear above as a seller or official action and are not repeated here; 11 additional citations follow.

Research last verified 2026-08-06.

1. Nissan Parts Deal — auto transmission transaxle fittingOpen source
2. Nissan Parts Deal — auto transmission transaxle fittingOpen source
3. Nissan Parts Deal — torque converter housing caseOpen source
4. Nissan Parts Deal — auto transmission control deviceOpen source
5. Nissan Parts Deal — propeller shaftOpen source
6. Nicoclub — nissan service manualsOpen source
7. Nicoclub — 98 240sx specsOpen source
8. Sonnax — 386 re4r01aOpen source
9. Manuals — 0823e5d116a995bc2a5d10d5818191ccb58299c24450dc0a952ce7496eb649aeOpen source
10. Nissan Parts Deal — nissan transmission assy automatic 310c0 44x63Open source
11. Ahparts — 220579 1Open source