Tranny transplant:

Great 1st to 2nd shift
Smushy 2nd to 3rd shift
crisp 3rd to 4th shift

I can't get the 2nd to 3rd shift to firm up no matter what I do.
I have tweaked the trans modulator every which way but loose!

If I remove all vacuum from the tranny then it will shift from 1st to 2nd so hard that it "barks" the tires (no joke). I have yet to get it to shift into 3rd w/out vacuum because it sounds as though the psitons will come through the hood.

The modulator does seem to be leaking down (mityvac indicates that). when I hook the mityvac up to the main vac line the needle jumps so bad that you can't get a reading. I even rebuilt the pump but the needle still jumps!

I don't know what else to do. I am getting really ticked!

Oilslick