This rearend is heavy duty as they came out in 1966,looked up the gears in this rearend on the ratings it shows 5200 lb under that shows 4.57gear- 4.11gear , nospin 5200 lb, the book that I got these numbers is a factory 1966 Chassis-cabs book I bought right here lots of good detailed information on this model of truck.Back to the rearend its 8 lug comes with 2 16 inch stock rims,also comes with the auxiliary rear springs mounts ,even the rearend stabliser bar with rearend. Easy to make a 1/2 ton into a 3/4 ton if desired by buyer.Take (,$200.00 dollars FIRM.) pickup only,if interested e-mail me at (mokeys66@hotmail.com) or P.M. THUR HERE