My grandson learned this the hard way. He replaced the carb on his 4x4 truck, and I told him he had to have the kick down adjusted correctly. He wasn't overly concerned, even though I told him it would kill the trans pretty quickly (he didn't think old men knew anything). About a week later, he asked me about a "trans problem" and I asked him if he adjusted the kick down like I told him to? Him and his buddies were going to "adjust it" later that day. I told him it was already too late. His trans only lasted about 2 weeks, but I suspect it wasn't in very good shape before that. The non-adjusted kick down was the nail that finished the job. Gene