# Differential pinion-height spacer selection (NA8)

Canonical URL: https://miatatorque.com/spec/differential-pinion-height-spacer-selection-na8/

Applicability: NA 1994–1997 (BP) — Actual 1994 factory evidence; other years in the approved family inferred with owner approval.

Confidence: fsm

Mark 08: 3.08 mm; Mark 11: 3.11 mm; Mark 14: 3.14 mm; Mark 17: 3.17 mm; Mark 20: 3.20 mm; Mark 23: 3.23 mm; Mark 26: 3.26 mm; Mark 29: 3.29 mm; Mark 32: 3.32 mm; Mark 35: 3.35 mm; Mark 38: 3.38 mm; Mark 41: 3.41 mm; Mark 44: 3.44 mm; Mark 47: 3.47 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": "differential-pinion-height-spacer-selection-na8",
  "name": "Differential pinion-height spacer selection (NA8)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NA",
      "years": [
        1994,
        1997
      ],
      "engines": [
        "BP"
      ],
      "note": "Actual 1994 factory evidence; other years in the approved family inferred with owner approval."
    }
  ],
  "kind": "non-torque",
  "value_text": "Mark 08: 3.08 mm; Mark 11: 3.11 mm; Mark 14: 3.14 mm; Mark 17: 3.17 mm; Mark 20: 3.20 mm; Mark 23: 3.23 mm; Mark 26: 3.26 mm; Mark 29: 3.29 mm; Mark 32: 3.32 mm; Mark 35: 3.35 mm; Mark 38: 3.38 mm; Mark 41: 3.41 mm; Mark 44: 3.44 mm; Mark 47: 3.47 mm",
  "procedure": {
    "notes": "Fourteen factory spacer choices in 0.03 mm steps. Select the thickness nearest the required pinion-height correction using the complete factory gauge procedure; install with the specified orientation. These are pinion-height spacers, not the single-use collapsible preload spacer. Metric values control; the NA printed 3.14 mm row repeats 0.1224 in from the 3.11 mm row. The original inch text is retained in the citation."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1994",
      "page": "M–38 (PDF p. 623)",
      "as_printed": "Mark   Thickness\n08   3.08mm {0.1213 in}\n11   3.11mm {0.1224 in}\n14   3.14mm {0.1224 in}\n17   3.17mm {0.1248 in}\n20   3.20mm {0.1260 in}\n23   3.23mm {0.1271 in}\n26   3.26mm {0.1283 in}\n29   3.29mm {0.1295 in}\n32   3.32mm {0.1307 in}\n35   3.35mm {0.1319 in}\n38   3.38mm {0.1331 in}\n41   3.41mm {0.1343 in}\n44   3.44mm {0.1354 in}\n47   3.47mm {0.1366 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": "driveshaft-differential",
  "component": "differential-inspection",
  "componentName": "Differential overhaul inspection and selection",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/differential-pinion-height-spacer-selection-na8/"
}
```