Description

Mitsubishi R4A51, V4A51 2000 Service Manual – OEM Factory Transmission Repair Guide

You’ve got a transmission on the bench that’s acting up. The valve body is pulled, and you’re staring at a pile of springs and check balls. Without the factory spring identification chart, you might as well be tossing darts. That’s where this 2000 Mitsubishi R4A51, V4A51 2000 Service Manual earns its place on your shelf. It’s 141 pages of the exact documentation Mitsubishi provided to dealerships. Not a shade-tree summary. It’s the real binder.

Inside, you’ll find the VALVE BODY SPRING IDENTIFICATION chart on page 23D-1-4. That chart tells you exact free length, outer diameter, and number of coils for each spring. No guessing which spring goes in the low-reverse bore vs. the second brake. You get the right spring, the right seat, the right check ball placement. That’s the difference between a clean shift and a burned clutch pack.

Valve Body Spring Identification – Why That Chart Is Essential

Without it, you’re relying on memory or a generic diagram from an aftermarket source. Aftermarket documentation is notorious for swapping spring positions or omitting the accumulator spring specs. This manual gives you the OEM data. Period. You also get the SEALANTS section on page 23D-1-12, which tells you which thread locker to apply on each valve body plug. Miss that step and you’ll be pulling the pan again for a fluid leak.

What Torque Specifications Does the Manual Include?

Every fastener on this transmission has a specified torque. The TORQUE SPECIFICATIONS on page 23D-1-5 list values for the oil pan, valve body bolts, extension housing, transfer case – all in lb-ft and lb-in. Using the wrong torque on a valve body bolt can warp the casting and cause internal cross leaks. That leads to slipping or no engagement. The manual tells you exactly what to use. No aftermarket shorthand, no rounding up or down. Factory values only.

141 Pages of Factory Documentation – No Shortcuts

This isn’t a condensed version. It covers everything from the GENERAL INFORMATION section through 23 chapters. The TRANSMISSION section alone (section 7) walks you through disassembly, inspection, and reassembly with factory tolerances. You get the SNAP RING, THRUST RACE, SPACER AND PRESSURE PLATE FOR ADJUSTMENT chart on page 23D-1-7. That chart tells you which snap ring thickness to use to set end play. Skip that step and you’ll have a transmission that whines or locks up. The manual also lists the required SPECIAL TOOLS in section 2, so you know exactly which puller or holder you need before you start. No guesswork.

Source Validity: Why OEM Beats Aftermarket Reprints

I’ve seen more than a few jobs come through my bay where someone used a third-party manual and ended up with a destroyed transmission. The aftermarket books often copy old revisions or miss updates. This manual is the original OEM print from 2000. It includes the factory sealants (listed in SEALANTS) and the correct lubricants for the V4A51 (LUBRICANTS <V4A51>). You cannot trust a reprint to have that data. If the sealant type or torque is off, you get leaks, failed clutches, or worse – a broken case. The OEM documentation eliminates that risk.

Mitsubishi R4A51, V4A51 2000 Service Manual – Inside the Transmission Sections

The manual splits coverage between the R4A51 and V4A51. Sections 3 and 5 cover the R4A51 transmission and extension housing. Sections 4, 6, 14-23 cover the V4A51 with the transfer case, including the Super Select 4WD II variants. If you’re working on a Montero or a pickup with the V4A51, you need sections 14-23. If it’s a rear-drive car with the R4A51, sections 3 and 5 are your focus. Each section includes cross-sectional views and step-by-step disassembly instructions. No shortcuts, no assumptions.

For other Mitsubishi models, check the Mitsubishi Dodge Stealth R/T Turbo 3000GT VR4 GTO Service Manual, the Mitsubishi Eclipse Spyder 1996 Service Manual – Factory Specs & Wiring, or the Mitsubishi SS-SERIES 2007 Service Manual – Factory Diesel Specs.

Understanding the fundamentals of a Manual Transmission can provide context for automatic transmission mechanics. For broader industry context, see the Automotive Industry Overview.

Frequently Asked Questions

Does this manual cover the V4A51 transfer case?

Sections 14 through 23 cover the transfer case and all drive shafts.

How do I know the torque specs in this manual are correct for my 2000 Mitsubishi?

These torque specs are taken directly from Mitsubishi’s factory service documentation issued in 2000. Every bolt, from the valve body to the transfer case adapter, has a specified torque in lb-ft or lb-in. Aftermarket manuals often transpose values or use generic numbers. This manual also includes the SEALANTS section (page 23D-1-12) that tells you which thread locker or sealant to apply and where, something reprints leave out. Using the correct torque and sealant prevents leaks and structural failure. I’ve seen transmissions ruined by using the wrong torque on the pump bolts. This manual eliminates that risk.

If you want to rebuild one of these properly, you need the factory numbers. Access the Factory Manual and get the full 141-page document. Your transmission will thank you.