[ss3011]

Based on your first time trial, you can bet that you lost the High Gear clutch. That clutch must come on along with the Lo/Rev clutch to get Reverse. Should be an easy fix once you get the transmission out of the car. The most common failure mode is the lip seals on the High gear piston are leaking. Make sure when it is rebuild that there isn't excessive clutch travel, that will lead to those seals to get damaged in short order.