Hello! Needing some help please. I have a 2002 Avalanche 2500 8.1L
When I reach speeds of 60+ and let off gas peddle, rpms go to zero yet engine revs up. Took it in and was told the housing unit on trans was broke and that could cause the issue. Had that replaced and engine still does it and even rides really hard it vibrates when reaching that speed now. It stops when I push on gas peddle however. Any suggestions on what it is before I spend more money please? Thanks in advance!!