It really depends on how much spline length you have in the tranny yoke, if there is 3.0 inches of spines inside the yoke then 3/4 inch sticking out from pushed all the way into the tranny with the car resting on the suspension with a full tank of gas and simulated driver and passenger weight in the car would be good in my book. If the tranny yoke had 4.0 inches of spline inside then 1.0 inches sticking out would work for me with the above conditions met