Automatic Transmission Problem

[leigh0680]

I have a 79 with an auto. Just switched out the carb and manifold for a flat plane and 32/36 DFEV. With help from the forum you can follow in my other post, I managed to get it installed and tuned. The car now starts, idles and revs perfectly.

The problem is that when I switch into Drive or Reverse, the engine immediately bogs down and quits. Stepping on the gas doesn't help, nor does shifting while at higher revs.

Any idea why it's doing this? The transmission worked fine up until the carb and manifold switch.

[GeorgeT]

Sounds like a torque converter issue. I believe that transmission is a GM unit.

[manladypig]

the problem is you have a automatic transmission

[Warren]

Did you connect up the vacuum hose (should have been replaced) from the new manifold to the transmission modulator tube? I retrofitted a single plane manifold and 34ADF carb to my 79 with auto transmission. Email me at whhopson@southernco.com for some marked up pictures.

[MattVAS]

Yeah sounds like an issue with the transmission modulator. Either no vacuum is still connect to it or the hose to it is bad or it is bad itself. Easy to replace if you have to replace it.

[leigh0680]

Wheeeee - the sound of me driving my car this past weekend. It's amazing - so quick and fun, feels like a whole new car. Finally now feeling that it was worth the effort.

Turns out I had accidentally loosened the back end of the line going to the transmission during my work so that the vacuum seal wasn't tight.

Warren, thank you so much for sending the pics. All the labels were really great and helped me track the problem. Would you mind if I post them here? I think others would find them useful.

Thank you to all the rest of you as well for your great advice.

[Warren]

Leigh:
You may post all my pictures of the 34ADF & manifold conversion. They have been sent to many members in the past.

Regards,

[jlopresto]

Hi guys,

Any chance I can see those pictures? Just bought an 85 with an auto. Previous owner told me the car had the exact same problem after switching to carbs. (Just got the car yesterday haven't started it up yet)

[wetminkey]

I like the sound of you driving your '79 2000, leigh0680!
I'll take that as a recommendation for the single plane and 32/36DFEV! Like your's, my Spider has a GM TH180 automatic transmission. I hope to afford a similar carb/manifold swap in the future.
Thanks for the feedback on your swap!
Todd.

[wetminkey]

And I see that there's a picture request,...any chance of posting some of your pics here?

[Warren]

Hello:
The PDF of my 34ADF/single plane manifold conversion on my 79 automatic can be obtained by emailing me at warren72955@netzero.net; my previous email (company) of whhopson@southernco.com will no longer work as I am retired.

[volzke]

Thanks for offering to share those photos Warren. The wife and I are mulling our options between a 34ADF and a 32/36 DFEV as a spring/summer project (this So.Dakota winter can't end soon enough, ha!). We also have a '79 with the auto trans. I'll send you a separate email requesting the document. Final note, an opinion on the 34 vs 32/36? I've been trying to see if anyone has a strong opinion or results one way or the other before we decide which option to purchase. Take Care.

[Cooter]

Do you happen to have a fiat with the automatic transmission?
If so, I need some help please.

Mike
Buffalo texas

Mrayborn61@yahoo.com