727 no 3rd wont shift

i did a little reserch and it makes sense that what bob shingler is saying, i have a floor shifter annd i start off in drive in i have first,wont shift i manually put it in second no problems there,and i never tried to put it into 1st manually at 40 mph(for obvious reasons)but i cant help but wonder if i did it would have shifted into 3rd,damn iwish i had of tried that.

One question,on a reverse manual vb what happens when u try to start off in low gear position?
Mine wanted to move very little and i could rev motor freely.

Jim if it were a manual reverse conversion that's exactly how it'd act because in the normal low position it would actually be in high gear. It would rev up and not move easy. Sounds like Kim and Bob have identified the issue.

If this is what the problem is the whole time,i will feel like a very green idiot!

Don't feel too bad Jim. I've been rebuilding torqueflites for nearly 30 yrs. and have never ran accross the manual reverse mod mentioned. I've seen aftermarket manual reverse valve bodies but didn't know they ever did it to a stock valve body. Good thing we have a couple members here that know that stuff.