I have a TH400 in my Nova. It was fine last time I moved it. Now when I put it in gear it kills the engine. If I hold the "Rs" up it will go into gear but very hard. Forward is same as reverse. I didn't go far enough to see if it shifted. When you stop it has to be put into nut. or it will kill the engine... Engine 454 chevy so I don't think its a power thing may be converter????