Description

Mitsubishi F4A4, F4A5 1999 Workshop Manual

If you’ve ever tried rebuilding an F4A4 or F4A5 using a generic aftermarket manual, you know the drill — torque specs are missing, spring identification is wrong, and you end up with a valve body that shifts like a seized dump truck. I’ve been there. That’s why this OEM Mitsubishi F4A4, F4A5 1999 Workshop Manual is the only thing I trust. It’s 116 pages of factory procedure, direct from Mitsubishi Motors Corporation. No reprints, no aftermarket guesswork.

Mitsubishi F4A4, F4A5 Transmission: Valve Body and Torque Specs

The valve body is where most rebuilds go sideways. Page 23A-13-1 starts the valve body section, and right before that you get the VALVE BODY SPRING IDENTIFICATION TABLE on page 23A-1-3. That table tells you exactly which spring goes where — length, outer diameter, color code. Aftermarket manuals omit this data. You get a blurry sketch and a prayer. Also, the TORQUE SPECIFICATIONS page (23A-1-9) lists every fastener on the transmission: pump bolts, valve body bolts, converter housing, pan bolts. Those numbers are in Nm, but you can convert to lb-ft. Use a calibrated torque wrench. Period.

What the 1999 Workshop Manual Covers in 116 Pages

Every chapter in this manual follows the same logic: diagram, removal steps, disassembly steps, inspection specs, reassembly steps, installation. The TOC lists 15 chapters starting with GENERAL INFORMATION (page 23A-0-3) through DRIVE SHAFT OIL SEAL (23A-15-1). You get OIL PUMP (chapter 4), UNDERSIVE DRIVE AND INPUT SHAFT (chapter 5), REVERSE CLUTCH AND OVERDRIVE CLUTCH (chapter 6), LOW-REVERSE BRAKE (chapter 8), SECOND BRAKE (chapter 9), OUTPUT SHAFT (chapter 10), and DIFFERENTIAL (chapter 12). That’s the whole transmission, broken down into subassemblies with factory step-by-step.

Oil Pump, Clutches, and Planetary Carrier: Step-by-Step

Chapter 4 covers the OIL PUMP — disassembly, inspection of the pump body and gears, and reassembly. Chapter 5 goes into the UNDERDRIVE AND INPUT SHAFT, including snap ring positions and thrust washer selection. The REVERSE CLUTCH AND OVERDRIVE CLUTCH section (chapter 6) gives you clutch pack clearance specs and the exact order of plates and discs. For the PLANETARY CARRIER (chapter 7 and 7a), the manual separates the F4A41/F4A42 without one-way clutch and the F4A42 with one-way clutch plus the F4A51. You cannot mix those up — different thrust washers, different snap rings. The manual shows both.

Use the Special Tools — or Waste Your Time

Chapter 2 is SPECIAL TOOLS (page 23A-2-1). Mitsubishi lists tool numbers for the oil pump puller, clutch spring compressor, seal installer, and more. You can sometimes improvise, but for the snap ring on the planetary carrier and the low-reverse brake piston, the factory tool prevents damage. I’ve seen guys use a screwdriver and crack the piston bore. That’s a $400 mistake. Buy or rent the tools. The manual tells you exactly what you need.

14 Chapters of Factory Data

Counting from chapter 1 through 15 (skip the foreword and intro), you get 14 technical chapters covering every part of the transmission. Each one includes a component parts diagram at the front with torque callouts and sealant symbols. The SEALANTS table on page 23A-1-10 specifies the exact Mitsubishi part numbers for gasket sealant and thread locker. Not “use a good silicone” — it tells you Mitsubishi Genuine Part No. MD970389 or equivalent. That level of detail is why this is a workshop manual, not a Chilton scrap.

Does This Manual Cover the F4A51?

Yes. The title says F4A4, F4A5, and the TOC includes chapter 7a for PLANETARY CARRIER ASSEMBLY , F4A51. The F4A51 is the five-speed version. The manual covers both four-speed (F4A41, F4A42) and five-speed (F4A51) variants. Make sure you know which version you have — the one-way clutch differences matter for the planetary carrier assembly.

Related Manuals

• Mitsubishi R4AW2-1, R4AW2-3, R4AW2-7 1996 Workshop Manual
• Mitsubishi Engine 4D68 (E-W) Workshop Manual
• MITSUBISHI ENGINE 4G5 SERIES WORKSHOP MANUAL

For a broader understanding of transmission types, refer to the Automotive Industry Overview and the Manual Transmission topic on Wikipedia.

FAQ

Does this manual cover the F4A51?

Yes, it covers both F4A4 and F4A5 series including F4A41, F4A42, and F4A51.

Are torque specs given in imperial units?

The manual uses metric (Nm) for all torque specifications. Page 23A-1-9 lists values in Newton-meters. You will need to convert to lb-ft if your torque wrench reads in imperial. A conversion table is not included in this manual, but the values are accurate factory specs. I recommend printing a standard conversion chart and keeping it in your toolbox. The main torque values you’ll use are around 30-50 Nm for valve body bolts and 150-200 Nm for the converter bolts. Don’t guess — convert correctly.

Is the valve body spring table included?

Yes, page 23A-1-3 has the complete valve body spring identification table with length, outer diameter, and color coding.

Can I use this manual for diagnostic procedures?

This is a workshop manual focused on removal, disassembly, inspection, adjustment, reassembly, and installation. It includes troubleshooting steps within each section, but for detailed diagnostic procedures like pressure testing or electronic control system analysis, you may need the separate service manual. However, the factory procedures here show you exactly how to test components like the oil pump pressure (chapter 4) and measure clutch pack clearance (chapter 6). That covers half the diagnostic battle. Aftermarket manuals won’t give you this level of detail on the F4A4 and F4A5 transmissions.

Access the Factory Manual now and get the exact same procedure Mitsubishi dealers used. No guesswork, no aftermarket shortcuts — just 116 pages of OEM data.