TH350 downshift cable firewall holes

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Old March 8th, 2024, 04:23 PM
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TH350 downshift cable firewall holes

Hi all, the 1970 Cutlass is getting ready to have the engine and trans reinstalled.
Question:
What is this little round hole next to the square hole for the cable? I searched the PIM and CSM and could find nothing on it.


The cable end that mounts to the firewall:

Last edited by rfpowerdude; March 8th, 2024 at 04:26 PM.
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Old March 8th, 2024, 07:37 PM
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Its been a while since I messed with this. But I believe there's a plug made for that hole if your car didn't need it when built. I think the plug is square and the round hole may be for a pimple attached to it that is a press fit to help hold the plug in place. Someone who knows for sure will have to speak up!
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Old March 8th, 2024, 07:42 PM
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The TH350 downshift cable pictured goes into the square hole, but there is nothing that goes into the smaller round hole. Or, I don’t know what goes in there.
If nothing, I could plug it as I have a bunch of various sized rubber plugs…
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Old March 8th, 2024, 08:00 PM
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Detent plug (exc. 35M38 trans.) Part # 3954594



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Old March 8th, 2024, 08:03 PM
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Since I have a TH350 kickdown cable that goes into the square hole, that plug is not for me. When the kickdown cable is installed, the round hole is open. I guess I just need to plug it with something.
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Old March 8th, 2024, 08:05 PM
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Originally Posted by rfpowerdude
Since I have a TH350 kickdown cable that goes into the square hole, that plug is not for me. When the kickdown cable is installed, the round hole is open. I guess I just need to plug it with something.
Agree. Chewing gum and a can of black spray paint.
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Old March 9th, 2024, 06:25 AM
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Yep Norm, that is what the PIM says to do (basically). I found a page that indicates what to do in this situation.




Thanks to everyone on here for putting up with my incessant pestering about getting this car back together right.

Once it is all together and mechanically fully working, I am going to drive it for a while (unrestored) before I blow it all apart and do a full frame off resto.
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