# Fourth-gear case-to-clutch-cylinder height difference (SB4A-EL 4AT)

Canonical URL: https://miatatorque.com/spec/4gr-case-cylinder-height-sb4a/

Applicability: NB 2001–2005 (BP-Z3, 4AT) — 2003–2005 factory references identify this component manual; 2001–2002 inferred within NB2 non-turbo family.

Confidence: fsm

Standard height difference A
About 2.0 mm

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": "4gr-case-cylinder-height-sb4a",
  "name": "Fourth-gear case-to-clutch-cylinder height difference (SB4A-EL 4AT)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        2001,
        2005
      ],
      "engines": [
        "BP-Z3"
      ],
      "trans": [
        "4AT"
      ],
      "note": "2003–2005 factory references identify this component manual; 2001–2002 inferred within NB2 non-turbo family."
    }
  ],
  "kind": "non-torque",
  "value_text": "Standard height difference A\nAbout 2.0 mm",
  "procedure": {
    "notes": "Assembly seating check when clutch discs/plates replaced. Install thrust planetary rear washer/race and 4 GR input shaft component first; measure the case-to-cylinder height difference at reference faces shown. Preserve About."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "workshop-sb4a-el",
      "page": "05–13Y–46 (PDF p. 58)",
      "as_printed": "Standard height difference A\nAbout 2.0 mm {0.08 in}",
      "verified_years": [
        2003,
        2005
      ],
      "document": {
        "id": "workshop-sb4a-el",
        "tier": 1,
        "title": "Mazda SB4A-EL Automatic Transmission Workshop Manual",
        "part_number": "9999-95-422H-99",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2003,
              2005
            ],
            "engines": [
              "BP-Z3"
            ],
            "trans": [
              "4AT"
            ]
          }
        ],
        "note": "The 2003 (PDF p. 1234), 2004 (PDF p. 1254) and 2005 (PDF p. 1388) MX-5 manuals explicitly reference part 9999-95-422H-99; the supplied copies are identical to the previously audited component manual."
      }
    },
    {
      "source": "workshop-sb4a-el",
      "page": "05–50–1 (PDF p. 87)",
      "as_printed": "Height difference between 4GR case and 4GR clutch cylinder (mm {in})\n2.0 {0.08}",
      "verified_years": [
        2003,
        2005
      ],
      "document": {
        "id": "workshop-sb4a-el",
        "tier": 1,
        "title": "Mazda SB4A-EL Automatic Transmission Workshop Manual",
        "part_number": "9999-95-422H-99",
        "covers": [
          {
            "gen": "NB",
            "years": [
              2003,
              2005
            ],
            "engines": [
              "BP-Z3"
            ],
            "trans": [
              "4AT"
            ]
          }
        ],
        "note": "The 2003 (PDF p. 1234), 2004 (PDF p. 1254) and 2005 (PDF p. 1388) MX-5 manuals explicitly reference part 9999-95-422H-99; the supplied copies are identical to the previously audited component manual."
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/4gr-case-cylinder-height-sb4a/"
}
```