Hey guys I have been trying to figure out what this noise is for awhile now. It sounds like a frog making a deep ribbit sound coming from the rear passenger side. The sound happens maybe a couple times a week (sometimes none at all); if I hear it then I will hear it all day. But then there are days it never happens. I was going to have it checked when I took my car in for the 30k maintenance but the guy said he had to hear it to take a guess what it was and on that day I couldn't make the noise happen. Every since then it stopped for about 1k miles now this past week it happened about 3 times during the whole day. Happens when shifting from 1st to 2nd or 2nd to 3rd. My first guess was the exhaust but then I noticed I can make the noise happened if I quickly press hard on the break for a sec. I have AMS tp and catback. Catback been on for 2 years and never happened and installed the tp over the summer but started only happening maybe 3 months ago. Any ideas..

 

Anybody??

 

rear acd pumping fluid to the differential