Hello new to the site and registered after reading all the helpful advice you have given. I have 84 LE van and have owned it for about a year keeping up on all basic maintenance. I think my tranny is slipping rpms go up but mph goes down or nowhere. literally came up out of the blue IO do not use my e brake often and live on busy street could getting nudged while in park effect transmission? Also what would you suggest on diagnosing and solving this problem? Thanks