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Post Info TOPIC: Linkage problem


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Linkage problem


I can't get my tranny to kickdown and I suspect the linkage I have may be a homemade job.

I have enclosed a picture if anyone has seen this kind of setup before let me know.



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A bit more info would be helpful. Assuming TH350, factory or OEM linkage and that this is a new problem.

Have you removed the linkage from the carb to ensure cable or trans connection integrity? I've seen the wire hook at the transmission end break off, leaving the cable to slip back and forth in the sheathing doing nothing more than following throttle linkage movement.



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72 Nova SS,   66 Beaumont Sport Deluxe,   09 Pontiac Solstice GXP Coupe



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Have you tried adjusting it so under full throttle is just about fully extended?

And that doesn't look like stock brackets for throttle and kickdown cable.

Mike has a great suggestion, unhook the cable at the carb end and pull on it to see if it's attached at the trans end.

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1966 Strato Chief 2 door sedan 283 "survivor"


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Thanks, it is attached at the bottom and will kick down for a very short period,I am sure it is a homemade bracket holding it together. Sorry about not supplying more info, it is a 350 with a 350 turbo transmission.

I have adjusted it as much as I can with WOT, but it is a sloppy fit. I just brought the car and am a new GM convert so my knowledge of these is limited.



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I've just installed a 350 with TH350 in my 66. I bought a new kick-down cable kit from shiftworks. Easy to install and works great. The kit comes with all the brackets and bits you need to install. It can be ordered directly from shiftworks but, as is possible with most things, I ordered mine from Summit. A little cheaper and their shipping is free to the border if you get your order over a certain dollar total.



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72 Nova SS,   66 Beaumont Sport Deluxe,   09 Pontiac Solstice GXP Coupe



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Mike Ward MB wrote:

I've just installed a 350 with TH350 in my 66. I bought a new kick-down cable kit from shiftworks. Easy to install and works great. The kit comes with all the brackets and bits you need to install. It can be ordered directly from shiftworks but, as is possible with most things, I ordered mine from Summit. A little cheaper and their shipping is free to the border if you get your order over a certain dollar total.


Lokar Hi-Tech Kickdown Kits KD-2350U

 



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72 Nova SS,   66 Beaumont Sport Deluxe,   09 Pontiac Solstice GXP Coupe



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Thanks I will check it out!



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Poncho Master!

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Another thought, is the vacuum line attached to the transmission. It's been a long time but I recall having an issue with a disconnected vacuum source to the trans.

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Eric - Regina, SK

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I will have to trace this out as I don't remember seeing a vacuum line going down there. The linkage is defiantly not working as it should.



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The vacuum line can be hard to spot. It will be a small metal line, probably bent to follow the contour of the trans, with rubber either end from manifold vacuum to the modulator valve. If the trans is shifting properly I don't think you have a vacuum problem. Kick-down is mechanical and the linkage should be fully extended at full throttle. It's a little tricky to adjust the linkage to full extension without holding back the throttle from full open.



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72 Nova SS,   66 Beaumont Sport Deluxe,   09 Pontiac Solstice GXP Coupe



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Thanks, I can't find the vacuum line running down, it doesn't seem to have one, but shifts ok in normal driving. I am going to order new linkage as the linkage it has is a homemade job that can't be adjusted properly. Nope did find the vacuum line its hooked up to the distributor. 



-- Edited by zak404 on Monday 26th of June 2017 07:04:15 PM

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Installed the new linkage as per the instructions and the trans still wouldn't kickdown. Vacuum line is hooked up and it shifts normally when driving, will only stay in low under full throttle till about 3000 RPM. So I know the linkage is defiantly attached in the transmission for the kickdown? Anyone else have any other ideas?



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