Chevrolet Repair: help, trans shop, trans fluid

Question
I have a 1973 chevy super cheyenne it runs but then when I put it in gear it wil go for a few minutes then it appears to go out of gear please help

Answer
Hi Eileen.... first off check the fluid level... make sure truck is warmed up and if level down add trans fluid.. dextron type 2... if it is full i would have it looked at by a trans shop, it could possably have a plugged filter or some internal damage....hope this helps