I have been trying to solve a trans leak on my car. The leak is at the tail shaft area, mostly when the car sits this time of year. I have done the obvious things, twice. Those included replacing tail shaft seals, bushing, gasket, and the rubber o-ring on the tail shaft. Replaced speedo seals, then replaced the complete speedo housing with a new one. I've replaced the pan gasket. I have decided to replace the slip yoke, even though it seems to have a good fit in the new bushings. It's the only thing that isn't new on that end of the trans. I am having trouble figuring out which yoke is a correct replacement. Here is what I know about what I have as far as my yoke: my yoke is approx. 6.75 inches from u-joint center line to end of yoke, has 31/32 splines that are counter bored. My yoke still has the nylon locks in the grooves, so an internal locking u-joint 3R yoke would be correct. The problem is that nothing matches the length dimensions of my yoke. I know that I can use a hybrid set-up of internal and external locks for the yoke, but again I'm not finding the correct length measurements. I know the transmission is original to my car. I know the rear-end has been changed to an 8.5 inch. I don't know if the drive shaft is original to the car (has external lock on rear u-joint, tabbed pinion yoke). It may have came from the car the rear end was in. Any suggestions, part numbers, etc. for the correct slip yoke would be a big help. Thanks, and sorry for the long winded explanation.