# Automatic transmission 2nd servo-to-transmission case (1991)

Canonical URL: https://miatatorque.com/spec/at-second-servo-to-case-na-1991/

Applicability: NA 1991 (B6, 4AT)

Confidence: single-source

60–78 in·lb / 6.9–8.8 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": "at-second-servo-to-case-na-1991",
  "name": "Automatic transmission 2nd servo-to-transmission case (1991)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1991,
        1991
      ],
      "engines": [
        "B6"
      ],
      "trans": [
        "4AT"
      ]
    }
  ],
  "kind": "torque",
  "torque": {
    "nm": [
      6.9,
      8.8
    ],
    "inlb": [
      60,
      78
    ]
  },
  "confidence": "single-source",
  "sources": [
    {
      "source": "mitchell1-1991-auto-transmission-overhaul",
      "page": "PDF p. 62",
      "as_printed": "INCH Lbs. (N.m)\n2nd Servo-To-Transmission Case 60-78 (6.9-8.8)",
      "torque": {
        "nm": [
          6.9,
          8.8
        ],
        "inlb": [
          60,
          78
        ]
      },
      "note": "Miata is explicitly listed for N4A-HL in the application table on PDF p. 1. Torque table on PDF pp. 61–62; limited to the 1991 Miata printout. Other Mitchell1 documents count as the same publisher.",
      "document": {
        "id": "mitchell1-1991-auto-transmission-overhaul",
        "tier": 2,
        "title": "Mitchell1 1991 MX-5 Miata: 1991 auto transmission overhaul",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1991,
              1991
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1991-1993/1991_auto_transmission_overhaul.pdf",
        "note": "Secondary service printout. Citations identify the Miata fastener and printed PDF page. Reproduced Mazda procedures are additional lookup locations, not independent factory evidence. Other Mitchell1 documents count as the same publisher."
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "automatic-transmission",
  "componentName": "Automatic transmission",
  "url": "https://miatatorque.com/spec/at-second-servo-to-case-na-1991/"
}
```