Bob, thanks for the reply. In haste some important facts were left out so will try to provide the reason for the question. I am converting to a 9 inch on an April 01,1968 San Jose built "J" code with a C 4. The whole thing started with an AOD conversion, which I love. Have an 8 inch 3.00 gear now but wanted a 9 inch anyway as these "J" code cars came with either one. So am putting in a 3.50 open, which along with the AOD will provide a "road gear" of 2.33. With the 3.00 and OD the final gear now is 1.99 which is pretty tall although the car seemed to do very well on a 1200 mile trip with temps in excess of 100 degrees. So even though things are being modified in the eyes of many I want to keep things as close to original as possible. Getting the pinion bracket is not a problem, I have it but only wanted to use it if Ford included it on an April 68 SJ car. By the way, I assume a GT 350 Shelby used this same set up, not sure about a 28 or 31 spline but as far as the pinion snubber goes it might be the same as any other GT "J" code? Anybody have one to check?