Mitsubishi Motors F3A21, F3A22, F4A21, F4A22, F4A23 1989 Technical Manual

Look, I’ve been inside more transmissions than I care to count. The one thing that separates a rebuild that lasts from a comeback that eats your weekend is having the real specs – the numbers the factory stamped on the drawing board. That’s why this Mitsubishi Motors F3A21, F3A22, F4A21, F4A22, F4A23 1989 Technical Manual belongs on your bench, not a PDF folder you never open.

160 pages of factory data for five automatic transmission models. Spanish text, but torque numbers and diagrams don’t need translation. If you’re working on any of these units – the 3-speed F3A21/F3A22 or the 4-speed F4A21/F4A22/F4A23 – this is the only source you should trust.

Torque Specs That Match the Assembly Line

Page 23A-1-10 gives the exact ft-lb values for the pump, converter housing, valve body bolts, and the planetary gear sets. I’ve seen guys guess on the 4-speed valve body bolts and snap them off. That doesn’t happen with this manual. The section ESPECIFICACIONES DE PAR DE APRIETE lists every fastener with its corresponding torque. No aftermarket guesswork.

Valve Body Spring Identification: 3-Speed vs 4-Speed

Two separate sections – IDENTIFICACION DE LOS RESORTES DEL CUERPO DE VALVULAS (MODELOS DE 3 VELOCIDADES) and the same for 4-speed models – give you spring color codes, free length, and outer diameter. Lay a spring next to the diagram, confirm you’ve got the right one before you drop it in the bore. Page 23A-1-3 starts that data. This is how you avoid a shift flare on the test drive.

Does This Manual Cover the Fuel System?

No. It covers the F3A21, F3A22, F4A21, F4A22, F4A23 automatic transmissions and nothing else. That focus means every page is relevant. You get the oil pump (chapter 5), front and rear clutches (chapters 6 and 7), final clutch for the 4-speeds (chapter 8), planetary gearset (chapter 9), differential (chapter 13), and the governor assembly for 3-speeds (chapter 11) and transfer shaft for 4-speeds (chapter 12). No filler.

Special Tools You Will Need

Chapter 2 lists the special tools Mitsubishi specifies for these units. Some you can fabricate, some you buy. Either way, knowing the factory tool number saves you from rigging a puller that scars the clutch drum. The manual shows the tools, not just names. If you’ve ever tried to pull a front clutch without the correct compressor, you know what I mean.

Why Factory OEM Beats Aftermarket Reprints

Every aftermarket manual I’ve touched has at least one torque value that’s off by 5 ft-lb or a missing spring identification. This is a direct scan of the original Mitsubishi Motors publication – not a third-party reprint. The INFORMACIONES GENERALES section includes the same precautions the factory gave its own techs: don’t use cloth gloves, clean metal parts with detergent, soak new clutch discs in ATF before installation. That level of detail disappears in the reprints. Compare this to any generic transmission guide and you’ll see the difference.

If you need a broader Automotive Industry Overview on automatic transmissions, that’s a different book. For this specific family of Mitsubishi boxes, stick with the OEM data. And if you’re comparing to a Manual Transmission, this is obviously not that – it’s all hydraulics and planetary gears.

FAQ

Is this manual in English?

No, the text is Spanish. But the torque numbers, diagrams, and part callouts are universal.

Can I use this manual for a F4A23 swap into a different vehicle?

The manual covers the transmission as a standalone assembly – disassembly, inspection, reassembly, and clearance checks. It does not include vehicle-specific wiring, shift linkage adjustments, or TCM programming for a swap. If you are adapting this trans to a non-stock platform, you will need separate vehicle wiring diagrams. However, the internal rebuild data (clutch pack clearances, valve body spring specs, end play shim selection) apply regardless of what car the transmission ends up in. The AJUSTE CON PLACAS DE PRESION, AROS DE RESORTE Y ESPACIADORES table on page 23A-1-6 gives the shim thickness ranges for the 4-speed models. That data alone can save you from buying six different shim kits.

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