<VV> PG upshift flare - vac modulator?

[Frank DuVal]

An odd question, but if you look into the vacuum port or the mechanical 
action port, do you see a screw head? If so you can adjust the spring 
pressure. I haven't seen one in years with a screw, but I have seen them.

Try disconnecting the vacuum line (plug it) and see if the flare changes.

Did you see ATF drip from the hose when you removed the old modulator?

Frank DuVal

On 3/21/2013 10:11 PM, Bryan Blackwell wrote:
> Hi folks,
>
> So here's something interesting.  A couple months back I reported a problem with smoke in the exhaust and low PG fluid on our '62 102/PG wagon, which I was told pointed to a bad vacuum modulator.  I picked up the new part from Clark's (improved! just for Corvairs! it said) along with the special wrench and installed it.  Took the car out and sure enough, no more smoke.  Great!
>
> However, now it flares on upshift - that is on the low to high shift, the engine momentarily revs higher, like it's low on fluid.  I double checked the fluid, it's ok.  The trans worked fine before, and other than the flare it works fine now.  So, did I get a bad one?  I found a few reports of this, but it's not clear if there's a better modulator than the one from Clark's.  Any other things to check - perhaps this has uncovered some other issue?
>
> As usual, thanks for any clues.
>
> --Bryan
>