1995-1998 S14 240SX KA24DE Factory Five-Speed Transmission Assembly

OEM numbers

320B0-70F00 = checked Nissan complete manual-transmission assembly for US 1995-1998 240SX S14 KA24DE, manufacturer note FS5W71C. Earlier US S13 catalog identity 32010-51F21, replacing 32010-51F00 and 32010-51F20, is disclosed only as a separate excluded branch. Clutch, flywheel, release bearing and fork, slave cylinder, mount, crossmember, driveshaft, shifter/boot, wiring, switches, speed-sensor parts, fluid and fasteners are not assumed included with a bare or used gearbox.

Supersession

No supersession into or out of S14 assembly 320B0-70F00 is asserted by the checked evidence. The separate S13 chain 32010-51F00 / 32010-51F20 -> 32010-51F21 does not prove S13-to-S14 interchange. FS5W71C is a transmission-family designation used in multiple Nissan applications; the family name alone does not establish the correct bellhousing, case, tail housing, shifter, mount, sensors/switches or output arrangement.

Fitment

Confirm US S14 chassis, VIN/build, KA24DE, factory manual equipment and exact 320B0-70F00 identity before buying. On used units, require clear photos of the complete case, bellhousing, tail housing, shifter opening, mount pad, input/output splines, speed-sensor/drive location, reverse and neutral switches, drain/fill plugs and all casting/label marks. Verify what is actually included. Rotate and shift the unit when possible; inspect input/output play, case cracks, broken ears, stripped holes, leaks, contaminated or metallic fluid and shipping damage. Diagnose clutch hydraulics, release hardware, shifter, mount and driveshaft separately before condemning the gearbox.

Aftermarket options

No current new aftermarket complete direct-replacement assembly was verified. Rebuild service may be appropriate only when a transmission specialist documents the exact S14 unit, internal inspection, parts scope and warranty. CD009/CD00A, SR/RB, pickup/Frontier and other swap paths require separate engineered conversion decisions and are not represented as direct replacements.

Before you buy

This is a deliberately narrow US 1995-1998 S14 KA24DE factory-manual guide. Nissan catalogs 320B0-70F00 for this branch but currently shows discontinued or backordered seller states, and no reproducible exact used price was retained; scarce sourcing is the public result, not a promise of stock. Do not buy from the FS5W71C family name alone or infer S13, Silvia/180SX, pickup/Frontier, SR/RB or other interchange. Verify the installed and donor identities, case/tail/shifter/mount/switch/sensor details, condition, included pieces, freight and warranty. Support the drivetrain safely and use the current factory service procedure or a qualified transmission professional.

Research and fitment sources

Supersede reviewed 15 unique research sources for this guide. All 15 citations are listed below.

Research last verified 2026-07-27.