Aluminum Ultra Case Assembly HD 40 Spline Lightweight Steel Spool 10″ Pro Gear & Chrome Moly Yoke

Strange Aluminum 10 inch Gear third member with spool and Chrome Moly Yoke

The Ultra case is used where maximum gear life is essential. This case and pinion support design move both pinion bearings into the case. This offers greater support than all other designs whereas the outer bearing sits outside the case. The pinion support has a tight fit to the case bore, further eliminating any flex that can occur. This coupled with the oversized tail bearing, firmly holds the pinion gear in proper alignment with the ring gear under the most extreme conditions.

The massive billet aluminum main caps complete this maximum effort design. This case supports 9” and 9 1/2” gear sets, and can use 10” development gears with the proper pinion support. All Ultra cases have a provision to use an optional load bolt if required. Bore sizes available are 3.250” and 3.812”. The 3.812” bore Ultra case is designed for a heavy duty lightweight steel spool that features a thicker wall on the bearing journal to eliminate the possibility of collapse under the most abusive conditions.

It also allows the use of an aluminum 40 spool were applications permit. The 3.812” is available in a special lightened version with a ball bearing pinion support commonly used in Pro Stock cars. Ball bearing supports are an option on non-lighten cases as well. For a Funny car requiring a coupler cover, a support with a built-in cover is an option.

Ford 10 Inch Gears require an aftermarket Ford 9 inch third member with sufficient clearance for the larger diameter ring gear. They however have a diameter measurement of 9.4 inches. They are typically recommended for cars making around Three thousand horsepower.

The cut on these gears is engineered for maximum strength and often these gears will run with significant noise compared with a traditional Ford 9 inch gear or 9/5 inch gear.