Gmc Envoy Problems Problems With My 1998 Gmc Envoy?

Problems with my 1998 gmc envoy? - gmc envoy problems

I have a 1998 GMC Envoy and I've met to refine the automatic support of precision. I was told that the cat converter rattle. What does this mean? and how much the repair?

I also need the rear transmission seal is mounted on my car that?

I have again the problem and try to get to my car as much as possible. Thank you!