Читать книгу Ford Differentials - Joseph Palazzolo - Страница 25

Recently, a unique 10-inch diameter gear set has been developed (for the off-road Trophy Truck market) that fits in the 9-inch-style gear case. It provides even more strength and torque-carrying capacity of the gears. Unique yokes are required for this arrangement because it has a larger 35-tooth spline as compared to the 28-tooth standard 9-inch pinion yoke. The axle housing requires some minor machining to obtain clearance for the larger ring gear.

These gears are massive and special for racing applications, so the ratios are limited; even the gears are expensive. A typical cost for one of these hypoid gear sets can easily be in the $1,100 range and ratio availability is sporadic. If a specific ratio demand slows down, then the ratio is no longer produced until demand picks back up. Once the demand reaches a certain level, a run of a specific ratio is made. Typically the following have been or are available: 4.11, 4.29, 4.71, 5.00, 5.14, 5.29, 5.37, and 5.43:1. Due to the high cost associated with producing these gears availability is ever changing.