we just rebuilt my fordomatic for the same time with same results, when we rebuilt it it will do into drive fine but once it warms up it pops out of drive and stays in low.. when we did it this time i had 2 parts trans, used the best out of each trans, and still the same results, we swithched valve body, pumps etc .. cant figure it out...

I have a fordomatic but am no expert but perhaps you have lost vacuum or have a clog , Have you replaced the torque converter?

rebuilt torque converter

Well, Beatnic, if appears that if you
have swapped transmissions and even
rebuilt one of them, then the problem is likely
not IN the trans. What's left ?
My guess is your problem has to do with the
trans. downshift linkage, which connects to the bellcrank
that also operates your throttle. If your kickdown linkage
is binding, or out of adjustment, it can cause the very
problem you're having.
If you can go to your local library, or if you have access to
an older Motor Repair Manual, it has adjustment procedures
for your car, and the different year models that have different
procedures.
Though you don't list the year of your tranny or the
type car it came in, I'm sure the answer to your problem will
be solved by checking this. The adjustment for all early 60's
model cars are listed in my 1968 Motor Repair Manual, so
that's about the year book you should look for, or earlier.
Good Luck with it !
_________________

That sounds like solid advice. I have a 1964 ford manual and it may have the specific info in it too. I will be happy to check it if need be.

First thing I would do is disconnect the downshift rod from the bellcrank and see if the problem goes away
_________________
1963 Fairlane Sports Coupe
1963 Falcon Sprint Convertible
1969 Mustang Coupe

its a 63 fairlane, 260 with the 2 speed fordomatic... rebuilt the trans twice now, this time used the best parts out of 2 parts trans, and it still has the same problems ..

i disconected the downshift rod and still has the problem

i disconected the downshift rod and still has the problem

i disconected the rod and still the same old problem

How would you know if the used parts you used were any better than parts you replaced?
What about all the seals? I'm not trannny expert for sure, but, when we rebuilt the old 2 speed, this was 10 yrs ago, we used what we thought was a good Fordomatic for parts, had a cracked case & samething happened, parts in the new trans were worn out too!
_________________
roger powell

Even if you disconnected the rod,
the lever on the transmission that
the rod attached to may be hanging or
sticking, or conversly, the valve inside that
the lever attaches to may be sticking. You
didn't mention if you checked that.


_________________

we checked the wear on all parts and used the best of everything and still have the same results...

it goes into drive till its warm, after about 1.5 miles it pops out of drive and goes into low

You may want to go to a real C-4 forum where trans guys lurk
there is a really good C-4 dedicated site over at fordmuscle.com
You simply have to join up, not necessarily become a member to post questions.
Very expierenced C-4 guys over there
_________________
roger powell