# Differential pinion-height adjustment tolerance (NB1)

Canonical URL: https://miatatorque.com/spec/differential-pinion-height-adjustment-tolerance-nb1/

Applicability: NB 1999–2000 (BP-4W) — Actual 1999 factory evidence; other years in the approved family inferred with owner approval.

Confidence: fsm

−0.032–0.032 mm {−0.001–0.001 in}

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-adjustment-tolerance-nb1",
  "name": "Differential pinion-height adjustment tolerance (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": "−0.032–0.032 mm {−0.001–0.001 in}",
  "procedure": {
    "notes": "Factory setup adjustment tolerance. Use the specified pinion-height fixture, average the left/right gauge readings, and account for the number inscribed on the drive-pinion end: subtract the inscribed number divided by 100; use zero if no number is inscribed. Select the matching spacer using the complete overhaul procedure. This is not the distance from the pinion to the ring gear."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "03–50–1 (PDF p. 370)",
      "as_printed": "Pinion height\n(mm {in})\n−0.032—0.032 {−0.001—0.001}",
      "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-adjustment-tolerance-nb1/"
}
```