727 shifting problem

Hi everyone, I am having a problem with my 727 TF.let me start from the beginning. 1979 dodge b-200 4x4 conversion the other day I was on my way to my job the customer has a pretty steep drive way and pretty long anyway I was on my way up it i put it in 2nd and began to climb got to the top no problem btw the 727 shifted fine no problems at all prior.so I worked all day end of day loaded tools fired it up tried to put it in drive and it felt like no gears (like someone disconnected the linkage.so I looked at the linkage under van all ok put my hand on the shift arm and able to to move it with ease the trans is stuck in park.had to have it towed home.next day went back to same job with my other dodge van this one has a 904 same darn thing happened but this one started put it in D and atemped to go home for the day this time it got me home but would not come out of second.got home turned it off tried the shifter same thing feels same as other van no shifter detent but this won't start I'm thinking because its stuck in 2nd.asked local trans shop told me there rates could need a total rebuild.anyone have any ideas ?????