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dawg Member

Joined: 10 Oct 2006 Posts: 449 Location: Colebrook Connecticut 15252.48 points
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Posted: Thu May 03, 2007 5:09 pm Post subject: recalibrating kickdown point on a TH 350 |
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since ive changed my rear from 3:08 to 3:73 the kickdown has been acting funny.
Itll kickdown for 2 to 3 seconds then back?
with the 3:08 it would hold it until I let off the gas.
Im assuming that the modulator would need an adjustment.
also id like to move the downshift up some
example : it would not go into kickdown over 55 mph
anything under 55 it would kick down
id like to move the limit up to 65 if possible
maybe a govenor spring or weight adjustment?
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af2 Member

Joined: 01 Sep 2003 Posts: 5579 Location: grassvalley, ca 71896.24 points
1933 Willys Coupe
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Posted: Thu May 03, 2007 5:28 pm Post subject: |
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Adjust the TV cable first. You might find that is all that needs to be done. |
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10sec.et Member

Joined: 29 Mar 2006 Posts: 3483 Location: Houston,Texas 347040.52 points
1969 Oldsmobile Cutlass
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Posted: Thu May 03, 2007 5:33 pm Post subject: |
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i assume youre referring to adjusting the detent cable. the modulator will control your upshifts and the detent will control your kickdown. theres a release on the cable end that you press to adjust. it basically makes the cable longer or shorter. you will have to try different settings to figure out what works best. _________________
af2 wrote: | It seems we can look at our magical Balls and come up with a fix?
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af2 Member

Joined: 01 Sep 2003 Posts: 5579 Location: grassvalley, ca 71896.24 points
1933 Willys Coupe
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Posted: Thu May 03, 2007 5:47 pm Post subject: |
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10sec.et wrote: | i assume youre referring to adjusting the detent cable. the modulator will control your upshifts and the detent will control your kickdown. theres a release on the cable end that you press to adjust. it basically makes the cable longer or shorter. you will have to try different settings to figure out what works best. |
Thats what I meant. |
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dawg Member

Joined: 10 Oct 2006 Posts: 449 Location: Colebrook Connecticut 15252.48 points
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Posted: Thu May 03, 2007 6:02 pm Post subject: |
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but the cable was fine with my old rear in the car but since changing to a higher ratio 3:08 to 3:73
its doing as I mentioned above.
I dont think the cable has anything to do with the kickdown duration or when kickdown comes in.
the cable is properly adjusted to initiate kickdown at full throttle.
btw isnt a TV cable for 700R4 tranny?
this is a TH350 |
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af2 Member

Joined: 01 Sep 2003 Posts: 5579 Location: grassvalley, ca 71896.24 points
1933 Willys Coupe
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Posted: Thu May 03, 2007 6:27 pm Post subject: |
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dawg wrote: | but the cable was fine with my old rear in the car but since changing to a higher ratio 3:08 to 3:73
its doing as I mentioned above.
I dont think the cable has anything to do with the kickdown duration or when kickdown comes in.
the cable is properly adjusted to initiate kickdown at full throttle.
btw isnt a TV cable for 700R4 tranny?
this is a TH350 |
TV is the 700. Detent is the 350 that's why I left the embarrass sign.
The kickdown will change on the detent cable because the throttle position between the 3.08 and 3.73 gears is different at the same given speed. |
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Big Dave Moderator

Joined: 04 Dec 2005 Posts: 2663 Location: Tampa Florida 120538.84 points
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Posted: Thu May 03, 2007 7:04 pm Post subject: |
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Unless I'm mistaken, and I often am, it works off the line pressure also so a spring change on the governor may be in order as well.
Big Dave |
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af2 Member

Joined: 01 Sep 2003 Posts: 5579 Location: grassvalley, ca 71896.24 points
1933 Willys Coupe
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Posted: Thu May 03, 2007 7:19 pm Post subject: |
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Big Dave wrote: | Unless I'm mistaken, and I often am, it works off the line pressure also so a spring change on the governor may be in order as well.
Big Dave |
The governator( as said in CA) works as up shift and doesn't let down shift until a given speed. The kick down is solely the detent and nothing more. The modulator also is in play on the up shift hence the different stripe color. |
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10sec.et Member

Joined: 29 Mar 2006 Posts: 3483 Location: Houston,Texas 347040.52 points
1969 Oldsmobile Cutlass
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Posted: Thu May 03, 2007 7:58 pm Post subject: |
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af2 wrote: | 10sec.et wrote: | i assume youre referring to adjusting the detent cable. the modulator will control your upshifts and the detent will control your kickdown. theres a release on the cable end that you press to adjust. it basically makes the cable longer or shorter. you will have to try different settings to figure out what works best. |
Thats what I meant. |
i was actually typing that at the same time you were. you just beat me to the post. _________________
af2 wrote: | It seems we can look at our magical Balls and come up with a fix?
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af2 Member

Joined: 01 Sep 2003 Posts: 5579 Location: grassvalley, ca 71896.24 points
1933 Willys Coupe
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Posted: Thu May 03, 2007 8:51 pm Post subject: |
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10sec.et wrote: | af2 wrote: | 10sec.et wrote: | i assume youre referring to adjusting the detent cable. the modulator will control your upshifts and the detent will control your kickdown. theres a release on the cable end that you press to adjust. it basically makes the cable longer or shorter. you will have to try different settings to figure out what works best. |
Thats what I meant. |
i was actually typing that at the same time you were. you just beat me to the post. |
It's about time I left at the light!!!  |
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dawg Member

Joined: 10 Oct 2006 Posts: 449 Location: Colebrook Connecticut 15252.48 points
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Posted: Fri May 04, 2007 5:38 am Post subject: |
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ill re adjust the kickdown cable
its easy enough |
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Paul P Member

Joined: 15 Aug 2002 Posts: 2454 Location: Townsend, Mass. 83266.64 points
1971 Chevrolet Chevelle
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Posted: Sat May 05, 2007 11:47 am Post subject: |
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You will need to adjust both the modulator and the kickdown cable to fix the issue. The lower gear has put less load on the motor changing the vacuum signal to the modulator. |
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dawg Member

Joined: 10 Oct 2006 Posts: 449 Location: Colebrook Connecticut 15252.48 points
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Posted: Sat May 05, 2007 4:29 pm Post subject: |
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ok I adjusted both and still its shifting too early
called the tranny shop and he has told me the govenor weights need changing aswell as springs |
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Paul P Member

Joined: 15 Aug 2002 Posts: 2454 Location: Townsend, Mass. 83266.64 points
1971 Chevrolet Chevelle
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Posted: Sat May 05, 2007 6:50 pm Post subject: |
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There are 3 things regulating shift points the transmission looks at Engine Load (vacuum modulator), Road Speed (governor), and Throttle position(kickdown cable). Modulator will only affect low speed shift points. The link below will help you.
http://www.indianachevelles.com/newsletter/Sept06Newsletter/page2.html |
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af2 Member

Joined: 01 Sep 2003 Posts: 5579 Location: grassvalley, ca 71896.24 points
1933 Willys Coupe
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Posted: Sat May 05, 2007 7:43 pm Post subject: |
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I thought we were talking down shift on this thread and am confused at this point? Must have missed something? |
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