[T3] 73 type 3 auto trans IAD?

William Jahn willjahn975 at gmail.com
Sat Jul 15 12:14:03 PDT 2023

The one I have now installed is a 72 auto trans IAD only difference. There
is no EGR tube on top and the extra port for the vacuum port only 72 models

 The issue now is the IAD has so much play on the lever side it binds once
the engine cools down after a drive but it seems to work fine driving and
it does not stick again until the next cool down. However I am certain
there is a good amount of a vacuum leak there, plus it has to affect the
TPS in some manner even though the play is at the cable end.

 I have the 73 IAD and it has a small amount of play , at least
acceptable.I can remove that and fabricate a block off plate and use the
old gasket or make a new one.

 I did try to find one in better shape and ISP West said they had one with
the PVC pipe but one it arrived I can see it is from a 72 manual trans and
it has no shaft play at all.

 I have two options. Use the 73 I have or to use the 72 manual trans. The
problem with that is it does not have the two vacuum ports for the auto
trans. It has bosses for them and I can drill the holes and tape for 1/16 "
NPT and install them. It's more work but can be done and I can swap the
auto trans lever over .

 I think the two trans vacuum posts are there so the modulator has vacuum
seen at idle and with throttle open. I need to run fluid through the one
near the throttle late to verify because I can't remember.

 I know the answer will be use the 73 which is the easiest but In also want
a spare so I can modify the 72 IAD ..I don't really need the kick down
because I never use it , I just let the trans do what it needs to. I don't
drive freeways. I don't floor it anyway. So I don't need to swap the shafts
to have a spare.I can just leave the kick down switch in place if I use the
72 IAD.

 I am going to try to swap the IAD without removing the runners. It has
been  done, it's just not as easy. To remove the runners is more work , the
injectors need to be removed while leaving the uel loop in place which I
don't like injectors just in the way and wrapped in thick cloth , the cover
plates to access the runner to head nuts and I'm not sure about the intake
gaskets , I put new ones on in mid 2019 so as long as the paper on both
sides lives they should be fine. If not then I need two more of these. I'm
just going by the Bentley stating they must be replaced anytime the runners
are removed. I never tried reusing them so I don't know.

 The only question in all of this seems my best bet is using the 73 IAD. I
did try to loosen the two small screws on the 73 throttle late but on this
one they are peened to they will not come out without filing the peen off
this seems to be done to keep them from falling out . The 72 manual trans
are not peened. I guess this was some after thought. .

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