Automatic transmission vacuum modulator

[Jarzki]

I have some trouble, it seems that my gearbox only uses 2 first gears. Might need more atf oil...now between low/full mark ? Other I am thinking is the vacuum modulator, there ia somekind of set screw, how big difference can it make ?

[vwsquare2]

There's a set screw in the vacuum modulator but before adjusting it, be sure the modulator is getting vacuum. What you describe could be the vacuum hose to the modulator is loose or not connected.

I had the same symptom and I was going to try adjusting the set screw. I went to pull off the vacuum hose and the old cloth covered hose fell apart in my hand. I pulled gently on the hose to trace it back to the engine and the other end of the hose pulled out of the engine. It had broken in the engine bay near the "T" that provides vacuum from the intake manifold. I replaced the hose and third gear was back.

If you had third gear earlier and it stopped working, check first to be sure you have vacuum to the vacuum modulator before trying to adjust it.

[Jarzki]

[Dfasty]

There is a vacuum modulator on ebay
Right now.
_________________
70 fastback automatic 06 invader

[Jarzki]

I bought TM-39 modulator for 20€ and my dad nodified the threads so it fits to VW gearbox...have not tested to drive nyself yet but acc. to dad it worked atleast equally well as the old repaired one.

[Multi69s]

[DQDan]

I wish one of you guys would help this guy out. He's been searching for this for years... on craigslist

[Bobnotch]

[Tram]

[Typ3nut]

Info gathered for the Type 3 fully automatic vacuum modulators
part#
003 325 391 (no letter) - dual carb
003 325 391 A (yellow stripe) - F.I. : 1968 thru 1971
003 325 391 C (brown stripe) - F.I. : 1972 & 1973
Color stripe signifies the years used.

[reay]

I have a VW available. I can't remember the letter, but I found a NOS unit for a dual Carb and used that. (I have a 68 type 34).

PM if interested.
_________________
Tom Reay
Nothing is standard o a Standard!
68 Karmann Ghia Sunroof / auto T345
66 Standard Microbus T221
66 1200a Standard 115 with factory ragtop

[DQDan]

[dickie]

I just found an automatic transmission for my 71 fastback, which was missing when I bought it. I can't find clear information about how it hooks up...the shift cable connector and connection....and the vacuum modulator on the side. How does it connect, where does it connect, how? Would anyone be able to post a photo or two or three that might illustrate these for me? Thanks. I have no other references. Any info would be great, thanks.

[Bobnotch]

[dickie]

Ok, thanks...i will check that out.

[Jpeter]

Hey everyone,
I have a 1990 westy, stock 2.1l and automatic transmission. When hot, shifting from second to third requires the foot of the accelerator and depressing it again, which causes som sort of reset and the third kicks in smoothly.
I think it is a vacuum issue, because it only happens then. No leaks, nos smoke, no smells, ATF looks great.
I was thinking that the vacuum modulator valve could be the issue? But why only when engine is hot and does not happen any other time?
The vacuum lines are connected, and all seems well. (well, the central door locking system does not work, which I guess uses the same vacuum?)
I appreciate any comments or ideas on how to start a problem solving plan.
the vacuum line that goes from the engine to the tranny loos good, not cracked

[Multi69s]