# Differential pinion-height spacer selection (NB1)

Canonical URL: https://miatatorque.com/spec/differential-pinion-height-spacer-selection-nb1/

Applicability: NB 1999–2000 (BP-4W) — Actual 1999 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-nb1",
  "name": "Differential pinion-height spacer selection (NB1)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        2000
      ],
      "engines": [
        "BP-4W"
      ],
      "note": "Actual 1999 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. Use the complete factory pinion-height gauge procedure and stamped pinion correction to select the required thickness. These are pinion-height spacers, not the single-use collapsible preload spacer; install with the beveled side facing the drive pinion."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "03–14–9 (PDF p. 364)",
      "as_printed": "Mark   Thickness\n08   3.08 mm {0.1213 in}\n11   3.11 mm {0.1224 in}\n14   3.14 mm {0.1234 in}\n17   3.17 mm {0.1248 in}\n20   3.20 mm {0.1260 in}\n23   3.23 mm {0.1271 in}\n26   3.26 mm {0.1283 in}\n29   3.29 mm {0.1295 in}\n32   3.32 mm {0.1307 in}\n35   3.35 mm {0.1319 in}\n38   3.38 mm {0.1331 in}\n41   3.41 mm {0.1343 in}\n44   3.44 mm {0.1354 in}\n47   3.47 mm {0.1366 in}",
      "verified_years": [
        1999,
        1999
      ],
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "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-nb1/"
}
```