Weird sound after fluid change

[zachattack_5491]

I changed my engine, trans, and diff oil the other day, and after driving around on it for a while there's a weird sound that happens at high RPMs. It's kinda like if you wrapped your BOV in a grocery store plastic bag. When I'm going at about 4500+RPMs and shift it makes the sound. I also noticed when I rev up the engine quickly when I'm parked it does it. I don't know what the problem is, I'm rolling with Mobil1 10w-30 Synthetic and Royal purple synthetic in the trans and diff. My car has been smelling like trans oil for quite a while, I don't know if i spilled some inside or if it's leaking or something. Any help would be appreciated.

[scottydog]

You need to have someone rev the engine and locate the source of the noise. It doesn't sound like the result of fluid changes.