recalibrating kickdown point on a TH 350

dawg

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 · Posted: Thu May 03, 2007 5:28 pm Post subject:

Adjust the TV cable first. You might find that is all that needs to be done.

10sec.et · Posted: Thu May 03, 2007 5:33 pm Post subject:

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 · Posted: Thu May 03, 2007 5:47 pm Post subject:

dawg · Posted: Thu May 03, 2007 6:02 pm Post subject:

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

af2 · Posted: Thu May 03, 2007 6:27 pm Post subject:

Big Dave · Posted: Thu May 03, 2007 7:04 pm Post subject:

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

af2 · Posted: Thu May 03, 2007 7:19 pm Post subject:

10sec.et · Posted: Thu May 03, 2007 7:58 pm Post subject:

af2 · Posted: Thu May 03, 2007 8:51 pm Post subject:

dawg · Posted: Fri May 04, 2007 5:38 am Post subject:

ill re adjust the kickdown cable
its easy enough

Paul P · Posted: Sat May 05, 2007 11:47 am Post subject:

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.

dawg · Posted: Sat May 05, 2007 4:29 pm Post subject:

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

Paul P · Posted: Sat May 05, 2007 6:50 pm Post subject:

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

af2 · Posted: Sat May 05, 2007 7:43 pm Post subject:

I thought we were talking down shift on this thread and am confused at this point? Must have missed something?