I have a t-5 (WC) transmission hooked up to a 235 chevy. When I drop in high-gear (5th) I get loud "grrrr" noise. It goes into 5th gear smooth. When I give it substantial pedal or take foot off of gas noise goes away. The loud noise occurs uder constant steady or slight accel/deceleration. I use ATF. Any insight would be greaty appreciated.