It is a do it your self. Drive 50-60 mph on level ground, then look at the tach. Let of the gas and note the tach drops, after a few seconds add power modestly. The tach will rise up and maybe a second or less the tach will drop showing the TQ has locked up. When you coast, the TQ unlocks letting you coast easily at low rpm. When you add power the rpm rises, and the system waits a second or less then locks up the TQ.How do I tell the auto repair shop to check that and fix it ?