if your not using a manual valve body i'd look at the kickdown linkage. i've had this problem before and it was always a kickdown adjustment.

After thinking about this.. I believe I have brought
this on myself.. I never had the conv cleaned out and
all my problems seem to be trash getting into the
system... I have all the gears right now but trash is
sticking stuff(VB and gov).. I chanced it the first time
and didnt have it cleaned out... its the same conv in all
of the builds

Hopefully this will be my last question...the
trans I have on the bench is the JY one that I
changed the pump on.. that trans didnt have reverse..
now when I opened it up I see that both of the nylon
rings on the input shaft were torn up... would this
be the cause of no reverse.. I think it is but I want
to ask and make sure.. everything looks like new in
it.. all the fibers and steels.. everything... I opened
up the OD and those look great also... so am I correct
to think the nylon rings would be the reverse issue...
thanks much guys... Im sending out the conv to have it
checked and cleaned.. I will clean out the cooler and lines

Anyone?

do they seal the supply for the front clutch?

I've always used the steel stepped rings.

Yes the rings will cause no rev. and 3rd ask me how I know lol.
P.S check the 3rd gear clutch pack to make sure it didn't burn the fibers.

I think they do.. but I would have to grab my book
in the shop and follow the hyd path

Exact dactly!

Thanks... the clutch looks like new.. still has
the writing on them
EDIT
I only drove it about 50 feet when I seen it didnt
have reverse

If you are talking about the small rings (about 1" in diameter) that are on the input shaft, they are the feed for the rear clutch that is used in all forward gears, not reverse. If you are talking about the larger rings that go on the pump, those feed the front clutch which is used in high and reverse.

I'm talking the 1" or so on the front of the input
shaft... I thought that ended up messing up reverse..
I was sure I seen this same thing on a 727.. but I
dont know much

Mike, the 2 sealing rings that you describe on the input shaft seal on the inside of the front pump housing and are for the rear clutch, which is applied in all forward gears but not in reverse. There are 2 rings mounted on the front pump housing that seal to the inside of the front clutch drum which apply the front clutch in direct, O/D, and reverse. In reverse, the front clutch and the rear band is applied.

You should be able to check both clutches sealing rings and both drums piston seals by air checking the front pump and drum assembly on the bench.

Right now all I know is it didnt have reverse and
the only thing I seen wrong is the 2 nylon seal
rings... I'll look tomorrow what the part name is

Sorry I thought you where talking about the stator support

Nope... the 2 seals on the input shaft.. the
reaction shaft support has 2 metal locking rings
which is on the back of the pump..they are fine..
looks like these 2 seals, seal on the ID of the
reaction shaft support

if you changed frt drums and frt pump from originals and mis-matched parts-like we used to do, you could have problems. we used to disassemble trans and save parts and would use a front/rear drum or stator support without checking to be exact same part. we shot ourselves in foot. now we check all parts by measuring individual parts or using all parts that are kept together. john kunkel had/has a pictorial reference of parts that is very good at determining correct parts.get it if you can. also we now air check parts on bench before putting in trans. somethings to remember are very hard but jk's pictorial is very good at helping determine correct parts. would like to see jk put together and sell picture book. would be great reference material. we have also talked to john cope and rick allison on odd ball stuff and those fellows are both gentlemen and very knowledgable. thanks to both and also john kunkel.

Mike, check out the replacement pump.

Years ago my dad had a 727 rebuilt for his truck. The builder was a low buck trans guy, who replaced the "worn out" pump. When we got it installed, it didn't have reverse. It seems to me IIRC it also needed a lot of throttle input to get it to move in forward gears. The builder couldn't find anything wrong with it and basically told us we were SOL. We tore that trans apart at least a half dozen times, and everything looked right, until I noticed the front drum was lightly rubbing the back of the reaction shaft support. It turned out that either the builder ordered a lock up pump for a non lock up trans, or the pump was incorrectly boxed and he didn't catch it or know the difference. We found a used pump in our stash, put it in, and the trans works to this day.
I know yours is a lock up. I'm just wondering how our experience would play out in reverse if your pump was actually for a non lock up trans. Could be worthwhile looking in to.

Figure anything out yet, Mike?

Just got the final parts today... I'm putting it back together
tomorrow.. but I am sending out the conv to Ultimate in a few
days to have it cleaned out and looked at
EDIT
I think I have this figured out.. I think with the
rings on the input shaft messed up that it had just
enough pressure to go forward(but I never left the
drive way) but not enough pressure for reverse