2002 chevy trailblazer_lt
just latley i have be noticing a tick sound coming from under my truck. it sounds like it coming from my transmission. but when i 'm in park and i rev the engine the tick gets faster. i just got a pcm forless tune with stage 2 shift points and it really kicks in hard in first when iam going like 40 to50 km. but if i punch it it's smooth. any idea what the ticking might be...