1992 F-250.
Engine size = 460.
Repairs for this problem = NONE
question = Upon take off from a dead stop, my Automatic tranny will
give a lurch and a clunk and go into the next gear.  It never happens
when driving, just on take off, and then, only sometimes.  Tranny guy
told me to change fluid and filter and check for broken springs from
looking up into bottom of tranny.  He said that Ford shifting springs,
though powerful, would at times break and make the sound and act
the way I described to him.  He said it could be repaired from the
bottom of the tranny without removal.  Does that sound like the
correct solution? And if so, where can I purchase the springs?  
Mechanic also that the one, original spring, is usually replaced with
two springs (one inside the other) to give a smother shift.  Thanks for
any help.

You can buy a transmission master rebuild kit for about $189.00 that
will have all the parts. You don't really need that though and a spring
is a spring so find the broken one and go to the dealer and buy a
spring and replace it. This dual spring setup is an update that Ford
has for this condition.

I would check the motor mounts first though as a broken motor mount
will give you the same symptom.