Slipping linkage / cable, and loose linkages are the most common cause of not going onto the right gear, but there can also be a problem in the valve body in the transmission, or a broken low / reverse band. Your observations that it shifts properly at times rules out a transmission problem. You're right about the linkage but most likely you'll need to crawl underneath and watch what's moving or slipping while a helper moves the shift lever. Be sure to block the wheels or have a helper you can trust to keep the brakes applied.
Saturday, November 15th, 2014 AT 1:30 PM
