Homologated Gear Pairs

Homologated and on the shelf

Gear pairs for the Porsche 901, 904, 906 and 908 gearboxes — homologated ratios, machined on our own gear-cutting machines to the same standard as our final drives. All pairs listed sit finished in stock and ship immediately.

Included: the Nürburgring ratio — the gear spacing proven on the Nordschleife, from stock without waiting.

Examples from the shelf: the 1st gear 14:37 for the 901, 904 and 906, the “Y” gear pair 28:23 (i = 0.82) for the 904 and 906 — and for the 356 the long 4th gear 21:28 (i = 0.75) for the 519 and 716 gearboxes.

Goes together

A gear pair rarely comes alone. From the same workshop, often from the same shelf:

• Final drives in stock+

  for the 901, 904, 906 and 908 — ground, numbered, with measurement report.
• Complete gearboxes+

  904 and 906 ready to install from stock, every fitted part available individually as a spare.
• Installation and set-up+

  on request we fit the gear pairs as part of a gearbox rebuild — with original setting tools and a final test-bench run.

Advice for your track and regulations

Which gear spacing fits is decided by track and rulebook: short ratios for hillclimbs and tight courses, long ones for fast circuits, the Nürburgring ratio for the Nordschleife. Tell us the car, the series and how it is used — we’ll tell you what’s on the shelf and what goes with it.