Custom steering column shaft is required when using all new after-market steering components (rag joint, universal joint, & steering shaft). This product is not required when using stock components. It is 36-inch long and is a 3/4-inch DD shaft. This shaft can be cut to length where needed. Custom steering column shaft is required when using all new after-market steering components (rag joint, universal joint, & steering shaft). This product is not required when using stock components. It is 36-inch long and is a 3/4-inch DD shaft. This shaft can be cut to length where needed. Compatible with 1947-1991 Chevrolet/GMC Truck Compatible with 1947-1991 Chevrolet/GMC Truck