Since I know next to diddly about transmissions, hope one of you guys on
here can help me..

Truck acts like it wants to move but seems to slip badly when I try to
start up start in OD position, starting in D, 2 or 1 works ok.. then I
can shift to OD once I'm up to speed.  Had it SEEM to slip ONCE in
Reverse.

Having read before that several things can cause similar problems, I
immediately thought of the 1st accum piston.. but then I would have
trouble in any position, right?

Then thought of the MLPS (did a search to get the term).

Also it SEEMS to me the trans is quick to shift down at a slight tip-in
or throttle change, at least in OD and D.

Guess I could rule out the TPS or VSS with these symptoms.. at least for
the primarily problem.. or can I?

What do ya think?