Recently I had my tranny worked on. Mainly I just had a new converter, a single disk sun coast. Also got a valve body and all the upgrades other than billet shafts and bad clutches. All the work was done at HTS. And ever since I have had a weird noise at idle. I mean I guess it sounds like normal knocking idle just different. The truck idles around 750 and you can hear it inside the truck with the radio off but can't really hear it outside the truck. But as soon as you give it a little gas and get the idle to 850 it goes back to the normal sound. But if you let off it goes back to the different sound. Now I dont know if the trans work and the sound have anything in common, but they just so happened to come at the same time. Any ideas????