My 420sel just lost all forward and reverse gears HELP! Cars a 1991 and the transmission was rebuilt 2 years ago and has been working perfectly till the other day .I reversed out of a parking space switched into drive and nothing , reselected reverse nothing no gears . Checked the linkage all fine ,oil level fine ,dropped the oil pan everthing looked clean and the filter was not blocked and gear change plunger was moving in and out of the valve body . Moving on decided main pump might be kaput so pulled driver side oil cooler line and started engine after a brief spurt no oil flow so dropped the transmission .Removed torque convertor lokked fine full of clean oil .Removed main oil pump , drive tabs were in place and pump looked great Removed valve body everything looks clean no signs of broken bits or dirt ! Please anyone any ideas what could be causing the lack drive .There was no wierd noise no warning just suddenly no gears . Help!!!