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KICK DOWN ADJUSTMENTS on TORQUEFLITE "cast iron"
Since I overhauled some Torqueflites I always had some problems with the "forced kick down" (or forced downshift 3-2 or 2-1 or 3-1). Generally it does not function properly and one depresses in vain on the accelerator, the car does not downshift..
VERY SIGNIFICANT: on all the "old transmissions" (before '70) the kick down occurs only in the last 1/10 inches before the pedal goes to floor. If you accelerate hardly but without going "to the floor" you will not have a kick down !
For a few weeks I have studied well the question, send requests to the mailing lists and made various tests.
Now I have a correct kick down on my Imperial !! It's just a matter of adjustment but NOT AS INDICATES IN the SHOP MANUAL . Only problem, as my transmission up shifts badly from 2 into 3 (lack of synchronization between release of KD band and engagement of rear clutch) I have it also in kick down 3-2. Thus my trans. should re-overhauled this winter. But at least it "(forced) downshifts" now ! Problem solved (at 90 %) : bad kick down band adjustment (with manual adjustment...), I'll let know what happen on mailing list.
The various methods of the FSM are described on the pics A-B-C-D-E below (click to enlarge). Approximately, here what is indicated (I summarize):
But this method doesn't work on my car ! If I make the FSM adjustment the transmission throttle lever can't go to "kick down" position (all the way backwards) when the accelerator pedal is floored..
I advise you to first test the FSM method and if it doesn't work (lack of KD), take a look at my method (bottom of this page)
Note: on all pics on this page the "throttle valve spring" has been removed for purpose of easier pics. This spring is between kick down and throttle valves , see position on pic # 1 and pic 4c.
Picture 1 : "release" position
(throttle lever on "stop" adjusting bolt). The port A is by KD
valve large diameter. You can seen a part of this large diameter at the left
of A . The "check balls port" has been
tracked on the other valve bodies and yes it leads to check balls "1-2" and
"2-3" which are in the lower valve body then to shift valves.
Click to enlarge
Picture 2 : As it is with light throttle (1/4 maybe ?). The throttle lever has pushed a little the KD valve. Port A remains
Picture 3 : You push hard on the gas pedal so throttle lever pushes on KD valve stem (you feel resistance because you must compress the valve spring). But the port A is always (the larger diameter hasn't still open the port, see pic) ... So no kick down
Picture 4 : maximum travel of throttle lever , the KD valve is all the way in and the valve spring is completely compressed (need a lot of strength..). Now the port A is open and throttle pressure can go to the check balls and 1-2 / 2-3 shift valves. The "larger diameter" KD valve closes now the opening between "check balls port" and vent port.
this is the kick down position
Now test the car ..
Our Thanks to Phil_The_Frenchie of Forward Look for providing this information.