Ford 9" 40 spline lightweight steel spool 7/16 bolts (3.812" Bearing)

Typically used in Top Alcohol Dragster and Pro Modified Cars. For 3.812" bore case 57448 or 57448-95S is required). Manufactured from through hardened 4140 high strength steel, black oxide coated. 

Instructions: SB0046

Features:

• Cut for 40 spline axles 
• 4140 Through hardened steel
• Uses 7/16 bolts
• Weighs 10 pounds
• Made in the USA

Note: We recommend replacing ring gear bolts every time a new gear is setup.