Also, with the 145K torque converter, it's offered
for both the 727 and 904. You didn't say which
one you have, or I overlooked it in your post.
The slightly rarer A-999 transmission is the
heavy-duty version of the A-904, so you have a
two basic versions of this type of converter, with
the other choice being for the A-727 transmission,
which is more common piece. Check on that weight
removal situation of that 145k unit. It could be
the direction you need to go for your problem.