I posted this in the Tech section, but I guess there is the possibility this may be PCM relaited. Anyway...

Just last night, I notice my TC is not locking up. Around the RPM and MPH it usually locks in 4th, the car just vibrates (Like an un-ballanced driveshaft). I hoped to get lucky and changed the tranny to the performance setting where I have the TC lockup a little later, no luck either. This is the first time for any troubles with this converter. It's a TCI Streetfighter and it didn't thrown any codes when this happened. Anyone take a guess??

Thanks for any advise.

~John