Southwest Speed New Steering RAG Joint, 3/4"-30 X 1 DD, Box Coupling Assembly, Shaft Coupler Brand New Steering Rag Joint(Part #105-9701).These arebrand newitemsproduced by Southwest Speed Inc. It is always a good idea to replace the rag joint when doing any work on the steering system. Rag joints provide a small amount of flex for a steering shaft within a few degrees of the same plane as the steering gear input shaft.They also provide some damping of vibration coming from the steering system, providing some isolation for the steering wheel. These joints will wear over time, so replacing them is an inexpensive way to refresh the steering system. Features: | * This includes both sides of the rag joint, not just one half | * Steering Shaft Side: | * 1" DD(Double D) | * Steering Box Side: | * 3/4"-30 spline Fits: | * Most GM 605 power steering boxes*** | * Most 1978-present GM 800 power steering boxes*** | * Most GM 525 manual steering boxes*** | * Some GM 122 manual steering boxes*** | * Most 1968-1983 Corvette manual steering boxes*** | * Several GM rack & pinions*** | * As well as numerous other applications ***Make sure to count your splines to verify which shaft your steering box has. This list is only a general guide. You can see a note at the bottom of the listing, which will help you determine how to properly count the splines***