vernisog

I've tried searching, but the clicking noises I find don't really pertain to my situation. The problem I'm having, is when I let off the gas while the car is in gear it starts to make a repid ticking. It only happens when I'm in gear and not accelerating. The axles in it are brand new, and we just put in a d16y8 trans. It's a whole world of problems, from it not wanting to stay in second when I lightly cruise, to a clunk when I take off in first. Something tells me it didn't get mounted right for one. Any help is appreciated as far as what this could be.