speedometer cables

I just cannot seem to Garage Break the Truck! It keeps peeing Transmission Fluid on the Floor!!! :nono I have a 727 Transmission that keeps leaking fluid from the speedometer cable. I have replace the Large O-Ring (6025752 or 6031370) and the Small Seal (2538588) and Cleaned it all up real good...

DEAR MOLDIE OLDIE VAN OWNERS, As many of us know our ancient warriors that we are so proud of, often as they age, the speedometer cable has worn out, broke, or one of various other reasons, you no longer see your speed registering on your dash. FOLKS the best news of all is I FOUND a Catalog...