Has anyone successfully used the USCartool A500 Crossmember?

If you want to know if the lock up is working for sure, just leave it on and try coming to a stop. It will drag down the engine just like a stick car would if you didn't press the clutch. I wouldn't stall the motor out but you should be able to tell easily. I have forgotten to switch mine off before and had this happen by accident.

Garth