My friend has a full size chevy 93 4.3 auto 2wd the front seal starting to leak bad.he pulled a truck with it about a month ago it. I was wondering what would cause it to blow out and if it was just old or what and what would it do if u would just replace the seal? The truck has 245,000 miles on it but i dont know if the trans has been replaced or what. it used about 3 quarts of fluid in about 20 mile range.