[T3] Auto shift issue

Mike Fisher fisherfarms at gmail.com
Mon Sep 14 10:42:42 PDT 2015


You haven't adjusted your VM with a hex key?  Nothing to lose by trying
that I wouldn't imagine.

On Mon, Sep 14, 2015 at 10:02 AM, Tim Keohane <rheorojo at frontier.com> wrote:

> Jim thanks for the reply. I did check the VW and it is an "A" unit. I was
> able to locate a "C" unit that is supposed to be a new O E german unit
> never installed. I'm thinking it's factory set but I will test it anyway. A
> double check, and I will learn a bit more. I didn't see a designation on
> the transmission, so will slide under and see if I can tell early or late.
> This car has seen many "shade tree mechanics" in it's time (including me)
> and I don't recall seeing anything but a single vacuum line. Will look
> through Bently and Chilton to see if I can get it correct.
> I will keep posting as I come across questions/answeres
> Tim
> 73 T3 auto
> On Sep 13, 2015, at 7:31 PM, Jim Adney wrote:
>
> > Sorry to be slow getting back to this. Things have been busy here
> > again. I checked my Bentley manual again, thinking that I might have
> > made notes of the late pressures in there. I see that it actually
> > DOES have the correct late pressure in one place, but not at another.
> >
> > Look on page 9 of chapter 8. The pressures are given in step 5. The
> > only pressure I've ever bothered checking is what they call the
> > throttle pressure, which for the late tranny should be 45.5 psi.
> > That's what you watch when you adjust the vacuum modulator.
> >
> > The '72-3 FI version of the VM is the C version. You might need to
> > make sure that you still have a '73 AT in there. I have one sheet
> > from VW that mentions a serial number for the early AT as being AB,
> > so my GUESS is that the later one should be different. I haven't been
> > able to find anything else on this.
> >
> > On my '73 I've noticed that the vacuum line to the VM is complicated:
> > It comes from 2 places and joins at a Tee. I don't think I've ever
> > seen an explanation of what's going on here, but on mine, I've been
> > tempted to replace those hoses since they wrap around the intake air
> > runners and look like they've flattened over time. It makes me wonder
> > if they are still doing what they were intended to do.
> >
> > --
> > *******************************
> > Jim Adney, jadney at vwtype3.org
> > Madison, Wisconsin, USA
> > *******************************
> >
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