[T3] Automatic Shifting

[Craigs List]

Jim,

I am going to take this one step at a time.

As far a "late" vs "early VM, I have a late one. I actually have 3 of them.
I also have an early one with the yellow stripe. I know that they are late
VM's because they were sent with the type 4 automatic that I got when I was
swapping out the automatic because of killing the differential case.

There was a noticeable improvement with shifting when I went from the
"yellow" VM to the "brown" one, but it still didn't like to shift at the
correct point.

As far as adjusting the VM's, this also didn't help with the shift points.

Now on to the valve body and governor. I have kept them consistent
throughout all o f the swaps. I did kill the governor that was originally
with this particular valve body, but I dissembled the broken governor and
moved the weights to the usable governor. This, to me, means that I still
have the correct governor with the correct valve body.

All of the VM's I have used have been checked for ATF leaks through the
adjustment screw. One was bad and thrown away. The other 3 I have are good.

This is all starting to point to a valve body rebuild in my eyes. I have
had the same problem throughout with a multitude of VMs and 2 different
automatics. I think I will look into a valve body rebuild as my next course
of action. What do your rebuild kits cost?

Adam


On Fri, May 2, 2014 at 9:00 AM, Jim Adney <jadney at vwtype3.org> wrote:

> On 2 May 2014 at 7:33, Craigs List wrote:
>
> > I have a question for those with automatic transmissions. Do all of us
> have
> > to shift with fluctuation of the gas pedal? My automatic likes to shift
> > into second far to early and never wants to shift into 3rd. I have to let
> > of the gas completely to coax it into shifting.
>
> It seems odd that one shift happens early and the other happens late,
> but the fact that blipping the throttle helps the 2-3 shift tells us
> that this is related to the vacuum modulator in some way. No, this is
> not normal.
>
> First, what year is your Type 3? The '72-3 ATs were different from
> the earlier ones, and they take a different VM. So the place to start
> is to make SURE you have the right VM and that it is adjusted
> correctly. The AT chapter of the Bentley manual covers the adjustment
> of the VM. The pressure they give there is correct for the early
> years; if you have a late AT, I'll have to dig for the number.
>
> You don't need the fancy pressure setup from the AT shop, but you
> will need a 50 psi pressure gauge that will screw into the 10 mm port
> on the side of the AT. I find that a 1/8" NPT gauge will screw in
> there nicely.
>
> Genuine VW VMs will have the part number stamped on the face of the
> VM. Early FI VMs end in A with a yellow paint stripe, while the late
> ones end in C and have a brown paint stripe. Genuine VMs adjust with
> an Allen wrench. If yours takes a small screwdriver, it's a generic
> aftermarket replacement and it will probably help if you install a
> correct one in there, especially if this is a late AT.
>
> If your car has been  converted to aftermarket carbs, this may be
> part of the problem, as the vacuum signal will be different from that
> which the VM was designed for.
>
> You should also pull the vacuum hose off the VM and see how much, and
> what color, oil drains out of there. A small amount of dirty black
> oil is normal and is just condensation from the intake manifold. If
> you get a lot of red oil, that's ATF and that means the VM is leaking
> and should be replaced (and adjusted.) Check the condition of the
> hose to make sure it is sealing well at both ends. Hose clamps should
> not be necessary, but the hose should be snug on its connection at
> each end.
>
> Finally, the VM sticks down slightly below the AT pan, so it's
> possible that it's been hit and bent. If it's bent, you could try to
> straighten it, but you may have to replace it. A bent VM can be
> sticky, and this might also explain your problem.
>
> If you have to replace your VM, keep in mind that ATF will pour out
> of that hole when you remove the old one. Have the new one ready and
> don't forget the alum sealing washer.
>
> Depending on what year you have, I may have a new VM if you need one.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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