I have a 48 3/4 ton chevy with the original 4 speed tranny linked to a 1967 250. I have an oil leak just to the rear of the ball joint and it goes down the first part of the propellar shaft and leaks out again at the support bearing. I have read the shop manual. the 3/4 ton does not have the same design for the placement of the cork seal as seen in the pics for the 1/2 ton. After using the shims as outlined for the ball connector where would the cork seal go on a 3/4 ton, also would a 1/2 ton universal joint kit work on a 3/4 ton. thanks again for the help chalres