That may or may not be enough to stop the "run away syndrome".
Here is some more reading that may help your situation.
If you want/need to repair your trunnion, go here.
http://www.onlycubcadets.net/forum/s...union#post9162
Then go here.
http://www.onlycubcadets.net/forum/showthread.php?t=43
And here.
http://cubfaq.com/hydrolurch.html
And finally here.
http://cubfaq.com/trunionrepair.html
Then after you get that fixed you will need to go here.
http://cubfaq.com/neutraladjust.html
I think that should pretty-much take care of it.