trans problem

i was driving home and the carb started loading up for some unknown reason i had to foot brake it for about ten miles when it would down shift into low it started making a grinding noise by the trime i got home i had no low gear or reverse i have second and drive its like its locked between gears it didnt slip or anything like that just when you put it in low or reverse it wont move 69 350 turbo chevy

Check your fluid level! If the gears are grinding, then you are low on fluid which will fry your trans in no time!

if you can hear an automatic gear noice you need a trany