Showing specs for all NA & NB Miatas

Differential drive-pinion/ring-gear backlash — minimum (NB1)

≈0.00197 in (0.05 mm) minimum0.05 mm minimum

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Minimum listed separately in the factory technical table. The assembly setup target remains 0.09–0.11 mm; do not set backlash to the minimum when assembling the differential. Use the full factory procedure for the cross-position inspection as well.

Applies to
  • NB 1999–2000 (BP-4W) — Actual 1999 factory evidence; other years in the approved family inferred with owner approval.
  • Verified in: 1999 Mazda MX-5 Miata Workshop Manual