# Five-speed transmission mainshaft locknut (1992)

Canonical URL: https://miatatorque.com/spec/manual-mainshaft-locknut-1992/

Applicability: NA 1992 (B6, 5MT)

Confidence: fsm

94–145 ft·lb / 128–196 N·m

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "manual-mainshaft-locknut-1992",
  "name": "Five-speed transmission mainshaft locknut (1992)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1992,
        1992
      ],
      "engines": [
        "B6"
      ],
      "trans": [
        "5MT"
      ]
    }
  ],
  "kind": "torque",
  "torque": {
    "nm": [
      128,
      196
    ],
    "kgfm": [
      13,
      20
    ],
    "ftlb": [
      94,
      145
    ]
  },
  "procedure": {
    "replace": "Mainshaft locknut",
    "notes": "Lock first and reverse gears as instructed, secure the bearing housing with protected vise jaws and stake the new nut after tightening."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1992",
      "page": "J–35 (PDF p. 379)",
      "as_printed": "128-196 N·m (13-20 m-kg, 94-145 ft-lb)",
      "torque": {
        "nm": [
          128,
          196
        ],
        "kgfm": [
          13,
          20
        ],
        "ftlb": [
          94,
          145
        ]
      },
      "document": {
        "id": "fsm-1992",
        "tier": 1,
        "title": "1992 Mazda MX-5 Miata Workshop Manual",
        "part_number": "1271-10-91G (9999-95-0428-92)",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1992,
              1992
            ],
            "engines": [
              "B6"
            ]
          }
        ],
        "note": "Cover identifies model year 1992; the download folder name is not evidence for 1993."
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "factory-transmission-1992",
  "componentName": "1992 transmission service & assembly",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/manual-mainshaft-locknut-1992/"
}
```