I noticed the radiator core support was rusted out pretty badly and was wondering if anyone has any experience swapping these out. Rockauto has one for $72 or something like that. Is it just un-bolt/bolt-in or is there welding involved?

2002 SS

 

If it's what I'm thinking of, it's a welding required job. There is a guy on NAIOA.com who has a write up about swapping his Impala to a manual transmission. During that time, he also has some pics of replacing the lower part of his radiator core support.

The core support on an '00-'05 Impala is the same as an '00-'05 Monte.

Unfortunately, I don't have a link to that thread handy