Ok I put a chip, line mod in the trans and a deep pan, also a 90mm intake, 2# lower pully. My truck has 28,000 miles on it and is a 2000. I have a little rattling sound in the cab when it is gear at idle. If I give it some gas it stops and if it is not in gear it does not do it. Do I need to look in to the sound or is this normal.

Thanks for the help, Dave

 

Ya I have heard a few trucks did that when you put a pulley on it. Call your tuner, I beleve they can fix it by turning up the idle 100 rpms or so.

 

Sal (LightningTuner) made a post about this just the other day. I don't have time to do it now, but if you search for his name, you'll find it (it was no more than a week ago).

Basically, the rubber on the stock pulley dampens this sound. He said that when the blades aren't under "tension," they'll flop around a little and bang together. Sal gave the example of making a "C" shape with your left hand and make your right hand look like "-"...now put the right inside the left and move it up and down so it touches the top of the C and the bottom of the C. This is basically what the blades in the supercharger are doing and that's what's producing the sound.

DUCK

 

I had that same sound on my 99 WITH 35 THOUSAND MILES.....my problem was that cats.....were damaged soo bad from high boost that it had braken apart inside and thats the rattling noise i heard.......when i had them cuts off chunks were coming out..............never had that problem again