This is a High Quality Motive Gear Performance ring & pinion set for the Chrysler Corporation 8.25" and 8.375" diameter rear used in many applications such as Dodge 1/2 ton pickups, Dakota, Durango Vans and many other Chrysler Corporation vehicles from 1966 to present. Strong and durable Motive Gear for long life and ease of set-up, these ring and pinions meet or exceed all OEM specifictions. This set is 3.55 Ratio and all the other ratios are available here at RiversideGear too! Questions? Call Customer Service TOLL FREE 1-877-614-4327 Monday thru Friday 8:00 a.m. to 5:00 p.m. EST.