What is the car?
An understanding of the situation leading up to this happening would probably help...
At what point did it start to make this noise?
Was it after you did a bunch of stuff to it, or just out of the blue?
Does it increase with rpm?
Was the trans working ok before, or is the first time out with it?
Do you have the flywheel cover installed?
Are you running a flex fan?
Fluid level in trans ok?
Hooking up the kickdown cable may help with some of the WOT issues. There is also another thread about using the 390 Holley that you may want to look into...
Last edited by gearhead; 02/05/09 07:33 PM.