Diesel tranny woes.....Help pleeze

I'm quite familiar wit 727's, but this overdrive/lockup stuff iz beyond me...When I wuz race'in, a 727 wuz a 727, now they got stuff I kan't control,,,So, I need sum expert advice...Hope'in sum ov U guru'z kan hep me out....

I don't thank it's major, but iz gunna leed to sumpth'in major if it keepz on....Tha converter ussa juss turn loose when I lifted off tha throttle, and seem to coast, until I gave it throttle, and then lock back up....I don't particular care for that part ov it's operation, but live'd wit it!!...I have a book that said I could hook a certian wire to a switch, and when grounded it would keep the converter lock'd...But, it never workd for me!!.....

Here lately, when I juss slightly lift off tha throttle, tha converter will drop out, and sumtimes go in and out, unless I keep a steady load on it...And, when I lift completrely off tha throttle, it will downshift, thro'in tha rpm way out ov it's good operate'in range.....Then it takes a lil bit to git it to shift back up into OD, and lock up...This iz a pain in tha azz when tow'in my camper on tha interstate, or even run'in empty on tha interstate, when one ov them fools gotta make ya git out tha throttle, while on tha cruise control.....

Any ov U tranny guru's got any help fer an ole penny pinch'in, do it yaself'r????