Gear Info
Guard Transmission utilizes the most advanced and modernized CNC gear-cutting equipment available. All of our gears are cut with class AA grade gear hobs and feature the latest F1 gear profiles. Contact pressure angles are optimized for maximum strength and each gear tooth has a very prominent “tip relief” placing all contact directly in the center of the tooth. This special feature eliminates any premature wear found in all prior gear designs., which typically occurs at the base and tip of each gear tooth.
All gears offered by Guard Transmissions are shot-peened to Aircraft specifications, which normally doubles the service life (in medium stress applications).
Stronger, quieterm longer-lasting. It has always been the goal of Guard Transmission to offer gearsets that are so superior in quality, that even the most discerning European race teams would take notice. These gears are now in stock.
Guard gears feature modern F1 tooth profiles. Helix and pressure angles are optimized for maximum strength. Each gear tooth has a very prominent “tip relief”, placing all contact directly in the center of each tooth. This reduces premature wear, typical in race use. Guard gears are also the only aftermarket gears to utilize Porsche ® factory German-made synchro teeth, and are the only aftermarket gears to have been sold directly to Weissach’s racing division.
For high horsepower Turbo applications, we strongly recommend our straight-cut synchronized gears (especially in 3rd & 4th gear positions), available in the above ratios.
Our billet mainshaft sets have a 30% higher torque rating than standard factory mainshafts, due primarily to the quill-shaft design. This also allows us to offer input shafts in varying lengths: Standard, “Short”, Turbo, and “Turbo short”. This design has been adapted by Weissach.
| 1st Gear | 2nd Gear | 3rd & 4th Gear | 5th & 6th Gear |
|---|---|---|---|
| 3.500(12:42)* | 2.471(17:42) | 1.800(20:36) | 1.364(22:30) |
| 3.167(12:38) | 2.412(17:41) | 1.789(19:34) | 1.333(21:28) |
| 3.154(13:41) | 2.375(16:38) | 1.750(20:35) | 1.308(26:34) |
| 2.833(12:34) | 2.294(17:39) | 1.700(20:34) | 1.286(21:27) |
| 2.692(13:35) | 2.250(16:36) | 1.684(19:32) | 1.273(22:28) |
| 2.538(13:33) | 2.176(17:37) | 1.650(20:33) | 1.261(23:29) |
| 2.429(14:34) | 2.056(18:37) | 1.632(19:31) | 1.227(22.27) |
| 2.000(16:32) | 1.600(20:32) | 1.217(23:28) | |
| 1.938(16:31) | 1.579(19:30) | 1.200(25:30) | |
| 1.895(19:36) | 1.550(20:31) | 1.174(23:27) | |
| 1.842(19:35) | 1.526(19:29) | 1.160(25:29) | |
| 1.789(19:34) | 1.500(20:30) | 1.143(28:32) | |
| 1.737(19:33) | 1.474(19:28) | 1.130(23:26) | |
| 1.684(19:32) | 1.450(20:29) | 1.100(30:33) | |
| 1.632(19:31) | 1.429(21:30) | 1.083(24:26) | |
| 1.579(19:30) | 1.409(22:31) | 1.063(32:34) | |
| 1.526(19:29) | 1.381(21:29) | 1.040(25:26) | |
| 1.364(22:30) | 1.031(32:33) | ||
| 1.333(21:28) | 1.000(25:25) | ||
| 1.308(26:34) | .971(34:33) | ||
| 1.286(21:27) | .960(25:24) | ||
| 1.250(24:30) | .941(34:32) | ||
| 1.227(22:27) | .923(26:24) | ||
| 1.200(25:30) | .909(33:30) | ||
| 1.174(25:30) | .889(27:24) | ||
| 1.160(25:29) | .867(30:26) | ||
| 1.130(23:26) | .857(28:24) | ||
| 1.083(24:26) | .840(25:21) | ||
| 1.040(25:26) | .828(29:24) | ||
| 1.000(25:25) | .821(39:32) | ||
| .960(25:24) | .815(27:22) | ||
| .775(40:31) | |||
| .750(40:31) | |||
| .679(28:19) | |||
| .667(30:20) | |||
| .595(42:25) |
* Denotes stock ratios
Other ratios are available by special order, normally at no additional charge.