91 crx si trans help

My trans is pretty noisey since I got the car. Chattering in the gears and what not. No slipping or popping though. Anyways, long story short I was just wondering if there are any good products out there that work somewhat to reduce trans noise and make it smoother shifting. I heard of this stuff made by Honda and GMC that supposivly works really good but I can't remember the name of it. Anyways, anyone got any good products I should try? Its a 5 speed, 10w-40 oil is in it rite now.

Thanks, Jim

Lucus Tranny Oil treatment.try it,it works wonders.

Honda MTF!!!