# Synchronizer ring to gear flank clearance — 1st, 3rd, 4th, 5th and reverse (NA8 5MT)

Canonical URL: https://miatatorque.com/spec/synchronizer-ring-gear-clearance-na8-5mt/

Applicability: NA 1994–1997 (BP, 5MT) — 1995–1997 inferred from 1994 factory evidence; actual-year verification is separate.

Confidence: fsm

Standard 1.5 mm; minimum 0.8 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": "synchronizer-ring-gear-clearance-na8-5mt",
  "name": "Synchronizer ring to gear flank clearance — 1st, 3rd, 4th, 5th and reverse (NA8 5MT)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "trans": [
        "5MT"
      ],
      "note": "1995–1997 inferred from 1994 factory evidence; actual-year verification is separate."
    }
  ],
  "kind": "non-torque",
  "value_text": "Standard 1.5 mm; minimum 0.8 mm",
  "procedure": {
    "notes": "Set the synchronizer ring squarely in the gear, then measure clearance to the gear flank around the circumference. Inspect teeth and taper surface for wear or cracks. These limits apply to the NA8 five-speed inspection, not the Y16M-D six-speed. Second gear uses the separate double-cone synchronizer assembly inspection. Display metric values under the metric-first policy; printed inch minimum is 0.032."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "J–24 (PDF p. 378)",
      "as_printed": "Synchronizer Ring (1st, 3rd, 4th, 5th and Reverse)\nStandard clearance: 1.5mm {0.059 in}\nMinimum: 0.8mm {0.032 in}",
      "verified_years": [
        1994,
        1994
      ],
      "document": {
        "id": "fsm-1994",
        "tier": 1,
        "title": "1994 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NA",
            "years": [
              1994,
              1997
            ],
            "engines": [
              "BP"
            ]
          }
        ],
        "note": "Mazda's base manual for 1994–97; later model years got supplements, which we haven't checked yet."
      }
    }
  ],
  "jobs": [],
  "system": "transmission",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/synchronizer-ring-gear-clearance-na8-5mt/"
}
```