What's the cost to fix a transmission reverse gear for a 94 buick lesabre V6

What is your question?

As I was driving I heard a hissing sound underneath the hood. As I continued to drive I was unable to drive pass 20 mph. When I stepped on the gas I heard a fluttering noise. I took it to the mechanic and he said it wont go in reverse but will drive forward. Estimated cost? Is it worth fixing?

What makes this problem better or worse?

makes noise when stepping on gas to go faster

How long has your 1994 Buick LeSabre had this problem?

1 day