Unless the tank is meant for whiskey,the best whiskey gets hauled in a hidden tank don't it?Whiskey or on the cob, not in the tank
That cam doesn't need any more than stock,but will work really well with a 2500 stall convertor.Disconnect the power[voltage ] from the trans.If the problem goes away,the problem is in the trans.
How was the lockup on the trans wired? What rear gear are you running?