[dataway]

So, last time I had my GTO out, one of the few drives I've made in it so far, it seems to shift pretty early.

It's got the original OEM modulator, which when tested with vacuum seems to operate as it should.

I was wondering, if I remember correctly, I think I put an extra fat, or possibly two o-rings on it because it was leaking a little bit. Would moving the modulator out (away from the trans) by the thickness of an additional o-ring effect the shift points? Seems like the vacuum pulls the plunger to the outside, so if the plunger was already moved out a tad by additional or fatter o-ring it would imitate a larger vacuum signal.

Also, would a tired spring on an old OEM modulator create shorter shifts?

I have an NOS Borg Warner unit on the way just in case.