[T3] Auto shift issue

Tim Keohane rheorojo at frontier.com
Mon Sep 14 10:02:47 PDT 2015


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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