Would a gu6 3.42 ratio rear axle assembly bolt into my astro that had a gt4 3.73

What is your question?

Have a 2003 Chevy Astro cargo van has a GT4 3.73 and cant find a used replacement would the gu6 3.42 bolt in from a 2005 Astro?

What makes this problem better or worse?

Replacing the rear axle assembly

How long has your 2003 Chevrolet Astro had this problem?

Over a month