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  #1  
Old 07-03-2016, 03:14 PM
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Default Strange transmission behaviour

When i drive away, the transmission starts normal in first, upshifts nicely to 2nd, but then it will downshift again to 1st, whereafter it upshifts again and then acts normally. The kickdown will not be activated. Is there any way of adjusting this?
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  #2  
Old 07-03-2016, 03:32 PM
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Normally I would say adjust your linkage per the shop manual however with the non factory linkage that you have you will probably have to adjust the kickdown using the trial and error method.

John
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Old 07-07-2016, 12:59 PM
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The kickdown at the best of times is a tough adjustment, because there are different factors. I found mine when done as per the manual didn't work but was really close. Trial and error and a lot of time making a really minor adjustment (1/4 turns max) got me there, the final was done by a transmission shop but he said it was really close.

Yours with that hand made linkage will be even tougher. But too much one way and the transmission slips, to much the other and it shifts like a cannon, the trick is to find a happy medium.
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Old 07-08-2016, 12:59 AM
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I did change the adjustment a bit and the shifting back to first happens later or sometimes not at all, so it seems that im on the right track. But it still seems that there is some slipping inside the transmission in first gear. The transmission makes a different noise at least, which should not be normal. Strange thing is that i didnt observe it during the test drive.
Trying to get a bit more into the transmission workings itself. Is there some good writing available on the net?
The throttle linkage input to the transmission, is that only for kick down, or does it also give an input to the transmission control system regarding the accelerator pedal position?
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Old 07-08-2016, 03:05 AM
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Default Strange transmission behaviour

Frank, just out of curiosity, what position are you putting the gear shift into when you start to drive away? D1 or D2? If you are starting out in D2, you are starting in 2nd gear and then it goes to 3rd gear. When you start the car and go to D1, you should be going through 1st, then 2nd and then 3rd gear. Always drive the car in D1, not D2. I am wondering if this might be having an effect on what you are experiencing.
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Last edited by YellowRose : 07-08-2016 at 10:01 AM. Reason: Corrected D1 & D2
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Old 07-08-2016, 09:43 AM
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Quote:
Originally Posted by YellowRose View Post
Frank, just out of curiosity, what position are you putting the gear shift into when you start to drive away? D1 or D2? If you are starting out in D1, you are starting in 2nd gear and then it goes to 3rd gear. When you start the car and go to D2, you should be going through 1st, then 2nd and then 3rd gear. Always drive the car in D2, not D1. I am wondering if this might be having an effect on what you are experiencing.
Ray,

You have that backward. D1 starts in first gear, D2 starts in second gear. Pretty easy to remember.

John
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Old 07-08-2016, 09:52 AM
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Yeh, i first was wondering what the D1 and D2 positions where doing, but after reading that D1 means 1st, 2nd and 3rd, im always using that position. I will first check the rigging of the shift lever with the position of the lever on the transmission.
But is the throttle input to the transmission only used for kick-down, or does it also give a throttle position input for other shifting purposes?
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Old 07-08-2016, 10:02 AM
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Default Strange transmission behaviour

Thanks, John, I guess I was half asleep when I posted that! I corrected it in my post so that it won't confuse others in the future...
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Old 07-08-2016, 10:11 AM
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Quote:
Originally Posted by Frango100 View Post

But is the throttle input to the transmission only used for kick-down, or does it also give a throttle position input for other shifting purposes?
When you floor the accelerator pedal the transmission will shift from third to second or passing gear as we used to call it so the kickdown needs to be adjusted correctly.

John
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Old 07-08-2016, 10:31 AM
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I think what you need to do is to make sure your vacuum modulator is installed correctly, then disconnect the kick-down linkage and test drive it that way. Transmission needs to warm up before you have a legitimate test. This will make sure your column linkage is set up and adjusted properly.

Once you get the transmission shifting properly when warm, then reconnect the kick-down and adjust that.
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