[bleedvw]

Have They Or You Replaced The Speedometer Drive Gear In The Transmission? It Is Located On The Speed Sensor. What Can Happen Is The Gear Gets A Crack In It And At Faster Speeds The Gear Starts To Seperate And Does Not Make Good Contact With The Gear On The Ring Gear. I Have Also Seen The Same Thing On The Plastic Gear That Drives The Speedometer Gear That Is Attached To The Ring Gear. If You Remove The Speedometer
Sensor, Which Is Very Easy To Do, You Can Look Down There And May Be Able To See Something. If The Problem Is With The Plastic Gear On The Ring Gear The Transmission Will Need To Be Torn Down For Reapir.