Got the car started ,trans me and friend rebuilt ,put a kit in it ,trans looked like it would work before we rebuilt it ,everything went good ,put trans in low or reverse it moves about a foot and stops ,goes another foot and stops does the same thing in reverse ,feels like a wheels is grabbing ,pulled pan off low reverse band was loose ,we set it too factory specs before ,it takes a 5/16 12 point socket ,75 inch pounds tighten ,loosen 2 rounds ,tighten jam nut 25 pounds ,readjusted it ,put back together ,does the same thing ,jacked car up checked all wheels ,put tranny in drive runs freely ,feels good trans works fine in drive ,i am lost here ,any ideas ,

Did you get the torque converter set all the way back in the transmission??

Yes torque convertor is seated in place ,it has second and drive ,but trys to lock up in reverse and second ,if convertor wasn,t in place i beleive car would try to roll in park

rebuilt a 727 last year...had problem where trans locked up in reverse but otherwise worked...

one of the sealing rings on the input shaft was broken during assembly...

did you air test the clutch paks?

Why would it roll in park? Park has nothing to do with the converter.

Car will not roll in park ,its in park like its supposed to be ,i said car binds up in 1st and reverse not 2nd gear ,put car in drive and it seems to work fine ,pulled valvebody ,grabbed one out of a junk trans and checked balls in valvebody comparing one that hasn,t been messed with ,everything is in the right place ,haven,t pressure checked it yet ,but going to ,bands etc all look good ,everything looks in order

That was in reply to your statement. "if convertor wasn,t in place i beleive car would try to roll in park"

I think i figured it out ,I probaly shouldn,t tell this ,but my mistakes are my lessons in life ,i never forget them ,in all this confusion ,i kept messing with rearband ,never paid any attention to kickdown band settings ,tore valvebody apart couldn,t find anything wrong ,kind of frustrated set down and started rereading manual diagones and found my description of problem ,locks or drags ,1 of the areas too look was kickdown band adjustment ,tighten 72 inch pounds ,back off 2 1/2 rounds ,crawled under car and looked ,we had tightened up ,but failed too back off ,i beleive this is my problem ,feel kinda stupid ,but beleive i have found my problem ,enough fun for tonight ,will reassemble tommorrow and try again ,thanks guys

Glad you found it. Happens to us all, especially as you get older. Thanks for posting the solution to your problem! I learn a lot from this board.