Description

Mitsubishi Stealth, GTO, 3000GT Service Manual – Factory Transmission Specs

If you are working on a Mitsubishi Stealth, GTO, 3000GT Service Manual transmission, you need the factory specs from Mitsubishi Motors. Not a Chilton reprint. Not a Haynes that lumped three different gearboxes together. This 103-page manual was translated from the original Japanese service manual by volunteers from 3000GT/Stealth International. It covers the Getrag W5MG1 and W6MG1 all-wheel drive transaxles found in the ’91-’96 Dodge Stealth R/T Turbo, ’91-’99 Mitsubishi 3000GT VR4, and ’90-’99 Mitsubishi GTO Twin Turbo. That is the only transmission this manual addresses, so no guessing about which clutch fork or synchro ring fits.

Torque specs matter. Get them wrong and you are buying a new transmission.

Clutch Section: Torque Specs and Special Tools

The clutch section starts on page 21. It includes torque specs for the pressure plate and flywheel bolts, plus lubrication points for the release bearing. They list the special tools needed, like clutch alignment tool and damper socket. Skip the pre-load check on the damper and you will get clutch chatter. Every torque value is pulled directly from the Japanese factory data—no aftermarket interpretation.

Manual Transmission Disassembly: Input Shaft to Transfer Case

This manual walks through the entire disassembly sequence: input shaft, intermediate shaft, synchro assemblies for the 6-speed, center differential, front output shaft, rear cover, front diff, speedo gear, and transfer case. Each sub-assembly has its own component diagram with torque values and non-reusable parts clearly marked. The 3/4 synchro hub for the 6-speed requires a specific press fit—don’t guess it. The manual also includes the Transfer Case Recall section for early 1990s models, which is critical if you are assembling a used case.

Torque Specs for the W5MG1 and W6MG1

Torque values are listed in the specifications table and scattered throughout the procedures. Page 22 includes the maintenance standards for the manual transmission. You get both inch-pounds and foot-pounds where applicable. For the transfer case recall, they detail the fix Mitsubishi issued for 1991-1994 models. Do not skip that recall check if you are rebuilding a gearbox from that era. The manual also provides sealant and lubricant symbols so you know exactly where to apply grease or thread locker.

Is This Manual Enough for a Full Transmission Rebuild?

Yes, for the transmission itself. But the manual explicitly says to use the vehicle-specific service manual for onboard diagnostics. This is strictly the transmission volume. If you need electrical diagnostics, refer to the 1991 Mitsubishi 3000GT Service Manual – Electrical Volume 2 or the Mitsubishi 3000GT 1990 Service Manual: OEM Factory Repair Guide for earlier models. Another good complement is the Mitsubishi 3000GT 1995 Service Manual – Factory Electrical Diagnostics if you are working on later electronics. For a broader perspective on OEM documentation standards, see Automotive Industry Overview and also Automotive Industry Overview for comparison.

Know Your Getrag: W5MG1 and W6MG1 Differences

The manual covers both the 5-speed (W5MG1) and 6-speed (W6MG1). The 6-speed has additional synchro assemblies and different input shaft bearings. The manual shows the shim selection procedure for the center differential. If you mix up the spacer specs between the two, the gears will whine. This document is the only source I trust for those clearance adjustments. The translation was performed by dedicated enthusiasts, but always cross-check the torque values against the actual component diagrams—they are accurate.

Frequently Asked Questions

Does this manual cover the 1992 Stealth ES non-turbo?

It covers only the R/T Turbo with AWD Getrag transmission.

Can I use this manual for a front-wheel drive 3000GT?

Absolutely not. The Getrag W5MG1 and W6MG1 are all-wheel drive units with a center differential and transfer case. Front-wheel drive 3000GTs and Stealths use a completely different transaxle design. The torque values, bearing preloads, and shim stacks are not interchangeable. Applying the specs from this manual to a FWD transmission will at best cause incorrect gear engagement and at worst crack the transmission case. Always verify the transmission type with the vehicle VIN before ordering a manual. For the FWD models, look for the Mitsubishi service manual specific to that transmission. This manual is dedicated solely to the AWD Getrag units. If you have a VR4 or Stealth R/T Turbo, you are in the right place. For anything else, put this manual down and find the correct one.

So if you are rebuilding a Getrag from a VR4, Stealth R/T Turbo, or GTO Twin Turbo, stop relying on Internet forum advice. Get the actual factory data. Access the Factory Manual and get the torque values that will keep that transmission together.